The Day Job

I have a full-time job, although ironically I’m not managing to blog nearly as much as when I was a classroom teacher, which was noticeably more than full-time. I’m fielding a lot of queries about physics teaching concerns on Twitter, which is fine, but I thought it might save me a lot of hassle if I put the same links here. Over a third of those teaching physics topics, according to data reported on p2 of this report from Wellcome, are not physics specialists. This matches the data I’ve seen through my day job at the Institute of Physics.

But before I say too much, let’s start with a disclaimer: what’s on my blog and on twitter from me is not official IOP policy or approved content. The IOP doesn’t care about the music I listen to, the political views I share, the arguments I have about gun control, mental health support or how to spell sulphur. (Well, maybe that last bit.) When I blog and tweet, I speak for myself. I’ll do my best to explain the IOP approach, for example with energy stores and pathways or the best way to support gender balance, but my bosses will only care about what I send from my work email account on work time. They’ll defend me on that – or not, as the case may be – but my off-duty self is not their problem.

Teacher support via the IOP

Whether you’re new to teaching Physics or have been heading your department for decades, the IOP has supporting material for you via the For Teachers page. Among other suggestions, this links to the TalkPhysics forum (free to join), which I recommend for queries that include more detail than the average tweet. There are several projects running to support schools, including the Stimulating Physics Network and Future Physics Leaders; these run alongside the locally-based Physics Network Co-ordinators. If you want your department to receive a little more support, you can join the schools and colleges affiliation scheme which gets you the journal Physics Education among other perks.

Detailed and in-depth discussion of pedagogy is broken down into 5-11, 11-14 and 14-16 topics on the Supporting Physics Teaching site. If you’re after something specific you may want to drop me a line on Twitter, but the content is evidence-informed and referenced. Great material for when you have a little time to think and plan.

The Improving Gender Balance project grew out of the Girls in Physics report. Lots of resources are available and my colleagues are always happy to talk to schools interested in applying these ideas. The last set of data showed that in around half of UK state schools not a single girl carries on to A-level physics; the imbalance in some subjects is even worse.

For hands-on advice the IOP supports the Practical Physics site. This grew out of the Getting Practical materials and is well worth exploring, with guides to pass on to technicians. You may also find the Teaching Advanced Physics (TAP) site useful, not least because some of the concepts are now covered in the GCSE curriculum as well as A-level.

If you’re an established physics teacher, the chances are that you do some informal coaching of colleagues even if you don’t have an official role. This is what my day job is all about, so please give me a shout so I can steal your ideas discuss the sharing of good practice. You may also be interested in Membership and applying to be recognised as a Chartered Physicist, and I have supporting materials that could help.

Other sources

I may be biased but I think the IOP materials are a good start. There are, of course, other places to look! I’ve been involved with a couple of these but others I know from using them with students or colleagues.

There are simulations available at PhET and the Physics Classroom. Understandably they take an American approach at times, but they’re well worth checking out. Double check suitability before setting for homework, as some will need Java installing or updating so may not play well on mobile devices. Both include pedagogy discussions for teachers as well as simulations for students.

STEM Learning – what I still think of as the eLibrary, and linked to the physical library at York – has loads of great resources, including versions of some of those linked above. Two collections in particular may be of interest, which organise the resources according to a curriculum: 14-16 science resource packages and A-level science resource packages. Bizarrely, the topics within each subject are alphabetical rather than logical, but that’s pretty much my only criticism. A free sign-in is required.

I do some freelance work with Hodder Education. The textbooks are obviously worth a look, but I’m not here to advertise. One project you can get for free is the Physics Teacher Guide. This is matched to the student textbook and online (subscription) resources, but may be useful even if you don’t have the budget to get for your workplace.

As an ASE member, I get the journal and magazine regularly. You shouldn’t need a login to access the Physics resources, which are an eclectic collection. I highly recommend the free downloads from the Language of Maths in Science project. Heads of Department might find membership worthwhile simply to access the Science Leaders’ Hub.

For Students

You may already pass these on to students – or have opinions about why that is a bad idea – but I think SchoolPhysics (from the author of the Resourceful Physics Teacher), HyperPhysics (concept maps linking physics ideas, probably best for A-level) and Physics and Maths Tutor (for past paper) are worth a look. Several of the above links, of course, may also be useful for them too.

A-level students can get a free e-newsletter, Qubit from the IOP. Hodder also publish Physics Review for A-level students, which is a good way to extend their learning beyond the curriculum.

EDIT: I was prompted about IsaacPhysics, which of course is a great site and one I recommend to colleagues. Questions are organised by linked topics for the spaced retrieval practice we all know is so important. Thanks to @MrCochain for the reminder. They also have funded places for a residential bootcamp this summer for students in England between years 12 and 13 who meet one or more criteria eg in first generation going to uni.

Please share any broadly useful resources via the comments; I’ve deliberately not started listing teacher blogs because I’d be here for ages. Maybe that can be a later post? But I have several others on my list, including materials to support the learning of equations and a review of an old science textbook. There’s never enough time…

 

Equation recall test

This was supposed to be a really quick job. For something I’m working on, I was looking at the equations students need to recall for the GCSE Physics exam (specifically AQA). And it annoyed me that they weren’t in a useful order, or a useful format for testing. So I’ve made a testing sheet, with pages for Energy, ‘mostly Electricity’ and Forces.

There are four columns, which are blank in the first three pages (for students) but completed in the answer sheet version. Because I’m good to you.

Download eqn testing sheets as PDF

Equation for…

I’ve given the word, not the symbol – thoughts? (Could/should that be another column?) I’ve removed a couple of what I see as duplications, and missed out momentum because I was thinking of this as for everybody. Plus it would have mean adding another row and I was sick of messing with formatting.

Which variables are involved?

For students to write in the variables in words, as a starting point. The idea would be that you can give partial credit for them getting part way there, because we should recognise the early stages of recall. You may off course have them skip this bit later on.

What are the symbols?

If they know the variables, can they write down what they will look like in the equation? This would be the other place for them to show they know what the ‘equation for…’ variable could feature in symbol form.

Equation

Formatted as best I can, in a hurry in Publisher. I’ve used the letters as listed on the formula sheet, p95 of the specification. Even when I disagree.

As ever, please let me know if/when you spot mistakes. Because it’s in Publisher I can’t upload the editable version here, but drop me a line in the comments if useful and I’ll send it your way.

Career Breaks

I recently got involved in a twitter conversation about getting back into the classroom, and what to do between jobs to make yourself more attractive to schools. This post is based on the email I put together, and I’m going to start with the same warning I gave my correspondant.

I should point out I’m no expert on recruitment; I’ve never held a promoted post in school so this is based more on conversations with colleagues and in prep rooms that I’ve had because of my day job.

Money

It’s got to start with supply (and cover supervising). This is always going to be a pain, but the good news is that you get to check out the school in advance. Different schools will have different rules about supply, but linking up with the HoD will help. There are ways to make that link – more in a moment. And exam invigilation, although less of an issue with fewer modules or AS, would still be a possibility.

You could plan to do some tutoring for now. The money isn’t great but the time commitment is fairly low. It’s best through word of mouth, but getting started with a few notices on community noticeboards and the coffee shops near colleges and sixth forms where students hang out can be effective.

The other choice is some kind of freelance publishing, possibly starting with TES or similar. If you have time, this is a good way to brush up on your pedagogy and stay familiar with specifications. Producing some generic resources on HSW or similar will be a useful thing to take with you when on supply, as it shows you’re a competent specialist. Other publishing stuff comes up online from time to time, but the hourly rate is fairly low.

Admin/Applying

Now’s the time to bring your CV up to scratch and work on phrases that will go into a cover letter. Review the CPD you’ve done and summarise responsibilities, so all the dates are to hand. Scan your certificates then put them all in one (electronic) place. Make sure you have up to date referee details, hopefully with a couple of spares.

As well as TES, make sure you’ve registered with local teacher agencies and the council recruitment page. Bookmark possible schools and their current vacancies pages. If there’s a standard LA application form – less common these days, but still possible – you might like to save a personalised copy with your information already added.

Brief digression: why the hell is there not a standard, national, teaching professional profile form? Because all the information the schools want is the same – just every form has a different, badly formatted order. Create a form, then insist every school uses it, with a one page ‘local supplement’ which teachers can then fill out. More time to spend on the cover letter…

It might be worth looking for the kind of post you’re after nationally, just to get a look at the kind of things that show up in job descriptions and person specifications. Then you can think up examples of times when you’ve done the kind of thing that matches up. This is how you can show that although you might cost more than an NQT, you’re much better value for money. (NQTs: this is where you look for non-teaching examples showing similar responsibilities and experience.)

Development

Try to see the time as an opportunity; a sabbatical, if you like! Explore subject associations and membership options. If there’s a local group, check out teachmeets and similar. If there are gaps in your skills that the CV check showed up, address them. Have you considered things like Chartered status? Even if you don’t go through the process, looking at the requirements might help inspire your next steps. And if travelling for conferences is possible, they are a great way to build your skills and knowledge. The Association for Science Education(ASE) is the obvious first choice, being teaching-specific, but don’t forget IOP/RSC/RSB either.

Quite a few universities and organisations offer free online courses – STEM Learning in particular. You can add these to your CV, of course! TalkPhysics is an example of a forum for teaching discussion where you can swap ideas, if you’d like something less structured. Or borrow some science pedagogy books, read and reflect. A nice talking point at interview…

You might like to contribute reviews on the books, or posts with developed resources, on a blog or similar. UKedchat welcomes guest posts, for example. These will start arguments and get discussions going; you might even get lucky and score some free review copies!

A different way to keep your skills up to date would be volunteering. Secondary schools sometimes want reading volunteers, but I’d also suggest looking at local primary schools. How about offering to do a primary science club for a half-term? I did this in my local primary, using the RI ExpeRimental activities, and found it really interesting. The IOP’s Marvin&Milo cartoons would also be a good starting point for accessible yet interesting activities. I had a whole new respect for primary colleagues too! You might already be a youth leader, but that’s also a possibility. Fancy running the Scientist badge for local Cub or Brownie groups?

It’s not something you want to do in September, but if you’re still looking in a few months then doing some development work gives an opportunity to get into school science departments. Choose a topic where teacher opinions would be useful or interesting, eg what resources would they use, or a survey of how they use animations in lessons. Do your research ahead of time. And then write a letter to the HoD, asking if you can visit and talk to the department to collect some anonymous data. The article will be interesting – you could even try submitting it to Education in Science or similar – and you get to talk to colleagues, sound out the school, and leave your contact details for when flu season hits…

As I said at the start, I’ve never been in a position of power when it comes to hiring, so I’d really appreciate corrections, additions and suggestions from those who have. What can Teacher X do?

Measurable Outcomes

Following a conversation on twitter about the phonics screening test administered in primary school, I have a few thoughts about how it’s relevant to secondary science. First, a little context – especially for colleagues who have only the vaguest idea of what I’m talking about. I should point out that all I know about synthetic phonics comes from glancing at materials online and helping my own kids with reading.

Synthetic Phonics and the Screening Check

This is an approach to teaching reading which relies on breaking words down into parts. These parts and how they are pronounced follow rules; admittedly in English it’s probably less regular than many other languages! But the rules are useful enough to be a good stepping stone. So far, so good – that’s true of so many models I’m familiar with from the secondary science classroom.

The phonics screen is intended, on the face of it, to check if individual students are able to correctly follow these rules with a sequence of words. To ensure they are relying on the process, not their recall of familiar words, nonsense words are included. There are arguments that some students may try to ‘correct’ those to approximate something they recognise – the same way as I automatically read ‘int eh’ as ‘in the’ because I know it’s one of my characteristic typing mistakes. I’m staying away from those discussions – out of my area of competence! I’m more interested in the results.

Unusual Results

We’d expect most attributes to follow a predictable pattern over a population. Think about height in humans, or hair colour. There are many possibilities but some are more common than others. If the distribution isn’t smooth – and I’m sure there are many more scientific ways to describe it, but I’m using student language because of familiarity – then any thresholds are interesting by definition. They tell us, something interesting is happening here.

The most exciting phrase to hear in science, the one that heralds new discoveries, is not “Eureka!” but “That’s funny …”

Possibly Isaac Asimov. Or possibly not.

It turns out that with the phonics screen, there is indeed a threshold. And that threshold just so happens to be at the nominal ‘pass mark’. Funny coincidence, huh?

The esteemed Dorothy Bishop, better known to me and many others as @deevybee, has written about this several times. A very useful post from 2012 sums up the issue. I recommend you read that properly – and the follow-up in 2013, which showed the issue continued to be of concern – but I’ve summarised my own opinion below.

phonics plot 2013
D Bishop, used with permission.

Some kids were being given a score of 32 – just passing – than should have been. We can speculate on the reasons for this, but a few leading candidates are fairly obvious:

  • teachers don’t want pupils who they ‘know’ are generally good with phonics to fail by one mark on a bad day.
  • teachers ‘pre-test’ students and give extra support to those pupils who are just below the threshold – like C/D revision clubs at GCSE.
  • teachers know that the class results may have an impact on them or the school.

This last one is the issue I want to focus on. If the class or school results are used in any kind of judgment or comparison, inside or outside the school, then it is only sensible to recognise that human nature should be considered. And the pass rate is important. It might be factor when it comes time for internal roles. It might be relevant to performance management discussions and/or pay progression. (All 1% of it.)

“The teaching of phonics (letters and the sounds they make) has improved since the last inspection and, as a result, pupils’ achievement in the end of Year 1 phonics screening check has gradually risen.”

From an Ofsted report

Would the inspector in that case have been confident that the teaching of phonics had improved if the scores had not risen?

Assessment vs Accountability

The conclusion here is obvious, I think. Most of the assessment we do in school is intended to be used in two ways; formatively or summatively. We want to know what kids know so we can provide the right support for them to take the next step. And we want to know where that kid is, compared to some external standard or their peers.

Both of those have their place, of course. Effectively, we can think of these as tools for diagnosis. In some cases, literally that; I had a student whose written work varied greatly depending on where they sat. His writing was good, but words were spelt phonetically (or fonetically) if he was sat anywhere than the first two rows. It turned out he needed glasses for short-sightedness. The phonics screen is or was intended to flag up those students who might need extra support; further testing would then, I assume, suggest the reason for their difficulty and suggested routes for improvement.

If the scores are also being used as an accountability measure, then there is a pressure on teachers to minimise failure among their students. (This is not just seen in teaching; an example I’m familiar with is ambulance response times which I first read about in Dilnot and Blastland’s The Tiger That Isn’t, but issues have continued eg this from the Independent) Ideally, this would mean ensuring a high level of teaching and so high scores. But if a child has an unrecognised problem, it might not matter how well we teach them; they’re still going to struggle. It is only by the results telling us that – and in some cases, telling the parents reluctant to believe it – that we can help them find individual tactics which help.

And so teachers, reacting in a human way, sabotage the diagnosis of their students so as not to risk problems with accountability. Every time a HoD puts on revision classes, every time students were put in for resits because they were below a boundary, every time an ISA graph was handed back to a student with a post-it suggesting a ‘change’, every time their PSA mysteriously changed from an okay 4 to a full-marks 6, we did this. We may also have wanted the best for ‘our’ kids, even if they didn’t believe it! But think back to when league tables changed so BTecs weren’t accepted any more. Did the kids keep doing them or did it all change overnight?

And was that change for the kids?

Any testing which is high-stakes invites participants to try to influence results. It’s worth remembering that GCSE results are not just high-stakes for the students; they make a big difference to us as teachers, too! We are not neutral in this. We sometimes need to remember that.


With thanks to @oldandrewuk, @deevybee and @tom_hartley for the twitter discussion which informed and inspired this post. All arguments are mine, not theirs.

CSciTeach Evidence

It’s odd, in some ways; for a profession which is all about leading and tracking progress for our students, we’re remarkably bad at agreeing any kind of consistent way to record what we do.

Years back I put together a Google Form for me to record what I was doing. The idea then was to match different activities to the Teacher Standards. To be honest, I didn’t use it for very long, although the process was useful in itself. Since then I’ve thought several times that a better way to track what I do is in the context of professional accreditation. For science teachers, who I work with in my day job, there are several things to consider for CPD tracking.

  1. Performance management forms are very specific to institutions, but in most cases having a record of what’s been done in between school-based INSET would help.
  2. There are several ways for a science specialist to become accredited; this is about recognising current knowledge and skills, not jumping through new hoops. CSciTeach is the route I chose, through the ASE (now also available via RSC and RSB). You may also wish to consider the new STEM Educator pathway. I have just completed the Chartered Physicist accreditation, which is available to physics teachers and teacher-trainers with appropriate experience. (I should point out I’m involved with making this better known to teachers/teacher-trainers and more information, exemplars etc will be out this autumn.)
  3. Having this information to hand can only be a good thing when it comes time to apply for new roles. I personally think it’s bizarre that there isn’t a single national application form, universal* with perhaps a single page ‘local detail’ for stuff a school feels just has to be asked. Otherwise colleagues have to waste time with many tiny variations of badly formatted Word forms, rather than their cover letters.

The thing is, who writes down every time they read/watch/observe something which ends up in a lesson? And if you do make a note of it, mental or otherwise, what are the chances of it being recorded in one central place? We end up with a formal record which has a few courses on it, and all the other ideas are along the lines of:

I think I got it at a teachmeet – was it last year? Might have been the one before. I’m pretty sure there was an article, I’ll have a look for it in a minute…

 


 

My Proposed Solution

What I’ve produced didn’t take long, and it’s only the first version – I’d really welcome ideas and suggestions for how to improve it. The idea is to gather information, reflect on impact and be able to refer back to it as evidence of professional practice.

If you want to try out the form, then feel free – this link takes you to my trial version and is not linked to the downloadable version below. You can also look at (but not edit) the resulting spreadsheet; note that the ASE guidance is reproduced on the ‘Notes’ tab. Thanks to Richard Needham aka @viciascience for some suggestions.

I’ve used the CSciTeach standards, but obviously (1) you need to do more than this form to be accredited and (2) other accreditation schemes are available.

Slide1

Slide2


Want to play around with your own version, editable and everything? You’re in luck:

1 Set-up

You’ll need a Google account. Go to the responses sheet (starting here means the formatting of the final spreadsheet is preserved.) Select ‘File’, then ‘Make a Copy’. Choose ‘Form’, then ‘Go to live form’; save the form URL as a bookmark on each of your devices. The spreadsheet URL will probably be most useful on something with a keyboard, but YMMV.

2 Capture

The form is set-up to get a few brief details fast, and then gives the option to skip to ticking relevant CSciTeach standards. If preferred, you can add the details of your reflection and impact in your setting at the same time. This completes the entry, but often you’ll want to come back when you’ve had a chance to think or try something out with students.

3 Reflect

Assuming you skip the in-depth reflection during step 2, you’ll want to return to the spreadsheet the form generates. I’ve included a few formatting points to make it work better which should be preserved when you copy it.

  • Column headings are bold
  • Columns are sized so it should print neatly on landscape A4
  • Text is justified ‘left, top’ and wrapped to make the columns readable
  • If empty, the columns for further reflection and impact are shaded red to prompt you to fill them in
  • The standards cells are shaded if at least one in that category has been ticked.

The point of CSciTeach, or any other accreditation is to recognise that ‘doing CPD’ is not a one-off event or course. Instead, it is a process, and one which should have reflection and consideration of measurable impact at its heart. This impact may be on students, teachers or both. This will very much depend on your role.

4 Share

You may prefer to keep the spreadsheet for your own reference only, using it to fill in other forms or complete applications. Sharing a Google spreadsheet is easy enough, of course; that’s the point! Just be aware that if you give ‘edit’ access, whoever it’s shared with can change your details. If you want their input – for example a professional mentor or coach – it might be better to give them permission to ‘view and comment’.

Alternatively, you might wish to search for particular examples and copy the results to a fresh document, depending on context. It would be easy to modify the form so that the Stimulus question was multiple choice, allowing you to categorise different kinds of formal and informal CPD. If colleagues think this would be more useful, I’ll create an alternate version centrally.

If, as a HoD or similar, you want to try something like this collectively, then it would be easy to adapt. Give the form URL to all team members and ask them to contribute. Whether you wish to add a question where they identify themselves is, of course, a more sensitive issue!


 

What Next?

Firstly; tell me what might be worth changing using the comments below. If I agree, then there’s a fair chance a version 1.1 will be shared soon. If you’d rather play around with it, feel free. I’d appreciate a link back if you share it.

Secondly, there are a couple of features which would be great to add. Being able to upload a photo or screenshot would be much better than copying and pasting a link, but I can’t see how to do this with a GForm. Related, if you think this could be developed into a mobile app then I’m sure the ASE would love to hear from you.

Lastly, yes, the SNAFU above* was on purpose. Those readers who understood can feel smug for exactly five seconds.

Energy Language Thoughts Part 4

Parts 1 (Introduction), 2 (Pathways/Processes) and 3 (Stores) are all available and will help make this more useful. Please continue to comment, on whichever post seems most relevant, if you’ve any queries or suggestions. Thanks to those who have already done so.

Practical Approaches

stores-or-pathways

The IOP guidance begins by taking snapshots before and after an event and describing the changes to various possible associated stores. The alternative is to think about the physical processes – which will be variably familiar to students, depending on age – and thinking about the effect they have on parts of the system. YMMV.

The famous energy circus can be used, but be cautious! Some make much clearer examples than others. In most cases you will need to be very specific about the start and end points you wish the students to consider. I recommend checking out the SPT guidance. In particular, the ‘one step at a time’ diagram shows why chains of energy can cause problems. The suggestion there, which I endorse, is that you:

  1. start with the idea of fuels ie chemical stores
  2. make clear that fuels limit effects, they don’t by themselves cause the effects
  3. give high, hot and stretched objects as equivalents, but as they’re clearly not fuels we associate them with
  4. gravitational, thermal and elastic stores respectively

Explained at SPT

I’d suggest looking at your energy circus for clear demonstrations of these to begin with. Next would come a kinetic store, probably as an endpoint. A gyroscope or Newton’s cradle is a nice example of a kinetic store which lasts long enough to be plausible.

Approaches to consider

You could have a first round to develop some basic ideas, then a second with more complex snapshots (either more than one store involved at the end, or the same kind of store but associated with different objects).

Have students identify just the stores to begin with, discuss them as a class, then come back and add descriptions for the processes. This could be split between lessons; that way you can provide correct stores in the second lesson and concentrate on processes. In some cases, such as the classic filament bulb, two similar pathways will be needed.

  • From: thermal store of filament
  • Via: heating by visible radiation, heating by IR radiation
  • To: thermal store of air in the room

If you want them, here are energy-circus-cards as pdf (includes example and blank cards)

Provide sets of laminated cards with stores, and arrows for the descriptions of processes. Labelled arrows are of course an option, but be aware of limitations and I’d include some blanks.

Again, cards-for-energy-v3 as pdf to save you a few minutes.

An extension could be to suggest measuring equipment and/or units for the relevant stores in each situation. If returning to these examples at GCSE, then recall of the equations are the natural next step.

Consider including actual photographs for some situations that cannot be easily reproduced in the lab; this would be a good way to introduce some examples from biology and chemistry. A food chain in biology might, for example, be described so:

  • From: chemical store of lettuce
  • To: chemical store of rabbit

Then

  • From: chemical store of rabbit
  • To: thermal store of rabbit, kinetic store of rabbit, chemical store of fox

And finally

  • From: thermal store of rabbit, kinetic store of rabbit
  • To: thermal store of air

For chemistry, exothermic reactions will involve heating by particles and/or heating by radiation pathways. If the material explodes (which in my experience is the preferred result) then there is some kind of mechanical working too, yes? Be prepared for questions about state changes; the best approach is that latent heat means the thermal store is not only identified by the temperature change. Which, yes, is a complication.

It’s probably worth adding notes – mental or otherwise – to the other science topics so you can remind students of the new language. If you have particular queries, drop me a line in the comments or, for a more considered answer, join in with the discussions on TalkPhysics.

This seems like a good chance to consider the Big Ideas in Science Education. Which should be up anyway, somewhere, but it’s always nice to have a reminder.

Exams and Textbooks

This is where I must admit defeat. I know – in fact I started the first post in this series with this point – that teachers want to know what will get marks and what won’t when it comes to the exams. Sadly, I don’t know. At least one board used the old language in the sample papers originally made available. The list of stores is not consistent between boards, though I hope that makes more sense after Part 3. And so on.

I’m sure we’ll all be happier once we see more examples of possible questions, but I’m not involved much with the boards so I have no insight. My advice – which isn’t official IOP guidance, nor is it specially informed – is that if your students can explain the mechanisms behind the transfers, they shouldn’t need to worry about the language, either pathways or processes. For the stores, it’s probably more important that they can identify the equations that are relevant and be able to do the maths – that, of course, hasn’t changed! I’ve recently discovered that Richard Boohan is putting together some materials; I shall be watching with interest.

Whether students will be penalised for talking about light energy, sound energy, electrical energy – that I don’t know. I also don’t know how much emphasis will be placed on this language by those marking biology and chemistry questions. So I’m not much good, really. Sorry!

Last appeal for comments, feedback, criticism… please let me know what you think of these four pieces. At well over 3000 words I appear to have accidentally written an essay. I hope that if you’ve waded through it, you feel it was worth your time. Please do give me a shout if there’s something I can do to improve the time spent vs time saved ratio.

Energy Language Thoughts Part 3

As you would expect, this follows on from Part 1 (Introduction and Summary) and Part 2 (Pathways/Processes). Even if you’ve read them, you might want to look back at the comments readers have made  – many thanks to everyone who has been able to take the time.

Descriptions vs Labels: Stores

The stores are not simply renamed ‘energy types’. A lot of them use similar words, but that’s because they’re trying to describe the same physics. They represent the changing properties of a part of the system, caused by it gaining or losing energy. When a steel block undergoes physical processes, it changes in a measurable way. It might change shape. Its temperature might change. It might be moved away from the Earth’s surface. It is a shame that exam boards are taking different approaches, but the eight suggested by the IOP are:

  • chemical store
  • thermal store
  • kinetic store
  • gravitational store
  • elastic store
  • nuclear store
  • vibration store
  • electric-magnetic store

More details at SPT

Like the processes, there are sometimes more than one way to consider what is happening. If a gas is heated, the change could be considered in terms of the measured temperature change (thermal store), or in the increased movement of the particles (kinetic store). Realistically, there are not many situations where two stores will seem equally appropriate. And when they are, this is actually a strength. The two approaches will give values for the energy change which are the same. Energy is energy, whether it is considered in the context of a thermal or kinetic store. The whole point of using energy as a ‘common currency’ is that is translates between contexts.

The stores, as discussed in my introductory post, are each a way of considering a physical measurement and an associated equation. The idea is that you consider the ‘before’ and after’ situations for relevant stores, as snapshots. (The exception, for school-age students at least, is a chemical store where the values are found empirically.) I produced, based on some ideas from IOP colleagues, some energy store ‘bookmarks’ which bring together the different aspects. They wouldn’t take long to put together, but you’re welcome to my version:

stores-bookmarks as pdf

Common Variations

The vibration store can be considered as a kinetic store which oscillates. The easier measurement is not speed but amplitude and time period. Imagine trying to find a meaningful value of the speed of a swinging pendulum, for example. But some boards are omitting it, which is fairly easy to justify.

I’m less happy that at least one exam board (AQA) miss out the nuclear store entirely. This seems like a huge mistake to me as it uses the one equation pretty much everyone knows from physics, E = mc2! It would also make it impossible to start with the sun, which makes most biology a bit tricky. (From nuclear store via particle heating processes to sun’s thermal store then via radiating processes to Earth’s thermal store and biomass chemical store)

The electric-magnetic store – not electromagnetic – is about the position of objects within two kinds of field. Now, I know they’re related – Maxwell’s equations and all that – but I think for most students it’s a lot easier to consider two separate stores, the magnetic and the electrostatic. The upside is that this means you can clearly link them to gravitational stores and so cover fields as a ‘meta-model’. The downside is that it makes the stores list look even more similar to the old approach. If you take this tack, make sure you emphasize that it’s an electrostatic store to clearly distinguish from the electric current pathway.

Which brings me to…

What about light/sound/electricity?

The SPT resources have some very good explanations on this. My reasoning is that they are processes which only have meaning if we think about duration. To describe them in numbers, we use power in Watts rather than energy in Joules. So they are, obviously, real physics effects. But they fit best into this model as processes shifting energy between stores, rather than stores themselves.

Disclosure: my issue with this is that a very strict interpreation of thi would seem to rule out kinetic stores as well. The snapshot approach – comparing the change to stores in between two static frames – makes it hard to reconcile a moving object with a single instant. Hmm. Although we have no problem with considering momentum at a moment in time, yes? Contrariwise, students may have an image of light as being made up of photons as moving objects, or when older the equation E=hf. Hmm again. And what about latent heat? This is best considered as a special term of the thermal store, but it’s not obvious. (Thanks to my colleague Lawrence Cattermole for reminding me of this today.) Of course, no model is perfect. The test is whether this approach is better than the ‘types’ of energy approach that has been so pervasive.

‘Better’, of course, is not a very scientific term! It is more accurate when describing the physical processes. The words are a closer narrative match to the equations students will need to use as they develop their physics. The model is different to what we and our students are used to, but objecting to it on that basis seems short-sighted. As I originally said, you could argue that the timing is unfortunate, with new specs and grading systems, but I don’t think we’d ever be at the point where all science teachers welcomed a change with open arms.

As always – please comment, respond, shout angrily at me using the field below.

Energy Language Thoughts Part 2

The previous post was a summary or introduction – thanks to all those who have commented already – and tomorrow I’ll be moving on to stores in more detail. But for now…

Descriptions vs Labels: Processes

To make life easier, humans like to use shorthand for complex processes. These are categories or labels, not detailed descriptions. Many pathways or processes can be put into one of these categories, but the aim should always be end up able to describe what is actually happening.

  • Heating by particles
  • Radiating (aka heating by radiation)
  • Electrical working
  • Mechanical working

Longer explanation at SPT

How we choose these categories will alter our interpretation. For example, are sound waves a form of mechanical working? Or do we include all waves in the ‘radiating’ category? The physics description of what is happening is what we and our students should be concentrating on, because it doesn’t change. The ideas about Johnstone’s Triangle that I’ve read about via Michael Seery’s blog, from chemistry education, has obvious parallels.

johnstones-triangle-1024x573

Reproduced from Michael’s post, credited to University of Iowa.

If we can link the macro (observations in lab) and sub-micro (particles and interactions) levels, the symbolic can wait. A similar discussion is had on SPT about alternating between the lived in world and a theoretical model.

Avoiding using these categories – which by their very nature are imprecise – might be worth considering. It would be very easy for students to think they have to assign any physics process to one of the four listed above, without really thinking through what’s happening. (If you’d like to consider symbolic approaches, I’d suggest checking out the physical versions of energy bar charts as described here by Greg Jacobs.)

As pointed out by several – most recently Richard Needham on Twitter – changing how energy is described in physics lessons means nothing if we can’t apply this to biology and chemistry. And it needs to make more sense there too! In school chemistry, heating and radiating (in the form of light-emitting) will be the significant processes. The equations used later on for enthalpy change – endo and exo-thermic reactions and so on – work nicely with this framework. In school biology, the transfer of energy is usually about photosynthesis (a radiating pathway fills a chemical store by the production of glucose/oxygen) or nutrition/metabolism. (More about stores in the next ‘chapter’.) One of my jobs is to have a closer look at the KS3 specification for any mention of energy in chemistry and biology and see what I’ve missed – please let me know in the comments if this has been done already!

I’ve heard – and contributed to – discussions about other possible pathways, perhaps useful for younger students. The regular suggestion is reacting, which would include chemical reactions in cells (aka metabolic-ing) as well as the lab. The shift happens between two chemical stores. The physics process, if we look closely enough, is about electron exchange between atoms. But I wouldn’t want to have that level of explanation in a year 7 lesson! As ever, the question is about us choosing a realistic level of detail for our students at any particular time.

The Power of Processes

I wrote earlier that we weren’t interested in how quickly a process worked. That’s obviously not always true; rates are very important in physics! So the process can happen quickly or slowly, which changes the magnitude of the final change in the relevant stores. This tells us that processes are about power, not just energy. (Thanks to Brendan Ickringill who pointed out the word rate is important.) The analogy I use is that of the carbon cycle. Asking how much carbon is ‘in’ plant biomass at any point is a meaningful question, if not an easy one. But it makes no sense to ask how much carbon is ‘in’ combustion, or any other process. They are rates, not amounts.

My colleague Trevor Plant reminded me of the need to change how we use Sankey diagrams for this new approach. The width of the arrow can now describe the power of the process, transferring or shifting energy between stores. A lot of the same questions could be asked, and efficiency is still a helpful consideration. We’d now think about useful processes (with values in watts) and wasteful or dissipative ones. As ever, we’d need to distinguish between similar processes; for example, energy shifted to the thermal store of water in a kettle is useful, whereas heating of the air around it is not.

Effectively what we’re doing here is describing what the ‘magical arrow of energy transfer’ is symbolising. A useful resource is a set of laminated arrows which students can write on for descriptions of the physical processes. You could provide some with descriptions on them, but the danger is that the class – or the loudest member of it – will then choose a best-fit rather than something more accurate. If you also supply laminated cards – as boxes, not arrows – with the eight stores on them, they are ‘encouraged’ towards the new model. These might be particularly useful to analyse a chosen selection from the famous energy circus.

On this theme, I produced some cards to go on the electrical sockets in the lab. The idea is to remind students that the current comes from somewhere else, and that the electrical supply is a pathway/process, not a store. Download below.

power-stations as pdf

As before, I hope the discussion here is useful – and please respond in comments if there’s something I’m missing out! Next post will be looking at stores in more detail, then hopefully a last one at the weekend on practical approaches and ways to adapt what you used to use!

 

Energy Language Thoughts Part 1

I was thinking ‘out loud’ on Twitter about the ‘new’ energy language, discussions prompted in part by science teachers applying the changes in their classrooms. I know I’ve blogged about energy before, but thought it might be time to have another crack at it. I’m not writing here in an official IOP capacity, although I’m also swapping these ideas with colleagues. All thoughts, responses, criticisms and offers of coffee accepted. And if you add the comments here it will be easier for others to join in, as twitter replies get lost after a while. Alternatively, as the responses to a twitter poll led me to post it in chunks, you might want to wait until it’s all done. I’ll crosspost the complete thing to TalkPhysics as well.

Challenges

  • Resistance to change – teachers as much as students!
  • Students who have learned one approach in KS3 and are now being told something different for KS4.
  • The exam boards can’t seem to agree on which stores to use and which to omit, which has knock-on effects for textbooks.
  • Teachers don’t know which answers will get marks in the exams, so don’t know what advice to give students.
  • Existing resources are incompatible with the new language – but with enough similarities to make it look like they’ll work (like a false friend in language teaching, which gives you confidence while misleading).

I don’t have answers for these. To be honest, nobody does! What I can say is that many people are trying to figure out the best way to make these changes work well for everyone. It is, in my personal view, unfortunate that they are coming in with both a specification and a grading system that are new. It’s worth noting the stores and pathways model hasn’t been recently  invented by the IOP to annoy teachers. For example: Robin Millar, Practical Physics.

There’s lots on the Supporting Physics Teaching resource from the IOP, but one place to start is this suggestion about useful things to keep in mind.

Hopefully Helpful Thoughts

A good thing about the ‘new’ language is that it encourages – pretty much demands – more attention on the actual physics. That’s the point. What is happening? So let’s start there; in any example, what process is involved? Some materials/sources call these pathways, but the idea is the same. Let’s not get hung up on labels for them, but on descriptions of actual events. It may help to emphasize to yourself that they are verbs, not nouns. They can happen fast or slow. But they involve actual physics, forces and EM and heating and so on (obligatory link to the Big Ideas of Science Education, because it’s awesome. When I rule the world every school science lab will have a huge poster of these.)

Now, these processes will change something. It means we can measure something which is different after this process compared to before. We’re not interested, right now, in how quickly this change has occurred – just that it has. This is a change – maybe a temperature increase, a greater separation of two objects, whatever – in a measurable quantity. This is associated with what we call a store. Different kinds of store have different equations, which link the measurable quantities together along with some constants. The result of that equation is a value for the energy associated with that store.

If we pay closer attention, we find that (at least) two stores have changed. What’s really interesting is that if we’re really careful, when we compare the equations, we find that the numbers are the same. An increase in one store is always balanced by a decrease in the other. The equations work as an exchange rate, showing how temperature rise in one part of the system is ‘worth’ faster movement in another part.

This, of course, is the principle of conservation of energy. Energy isn’t lost. But we can lose track of it. Sooner or later, the processes end up heating up the entire universe. Because the universe is pretty big (no, bigger than that) the change in temperature is effectively immeasurable.

So there we are; a very brief introduction to the ‘new’ model. More posts coming up, hopefully one per day. The sooner you comment, the more likely I can address your suggestions in the course of the series!

Funding a Science Ed Project

A quick appeal for help: I’ve got a cunning plan and would love to see it happen. But I’m going to need some help.

I’ve written before (see the second half of this post, which I’ve cannibalised below) and complained on Twitter about finding science teaching resources. It’s hard. And, frustratingly, it’s harder than it needs to be. Quality control comes at the expense of  accessibility. Good resources take time and money to produce, and then they need to be kept somewhere. There are some great resources which most people know about; Practical Physics (and the biology and chemistry equivalents, naturally) for example. There are good directories which make an effort to organise materials so they can be found; the eLibrary from STEM comes to mind.But could we do better?

Brief

  • links to resources, rather than hosting them all
  • sortable by key-stage, topic, type of resource
  • some kind of meaningful review/curation/approval process
  • free to use without login

The last one is probably the sticking point. Who would spend the time and money to produce something like this, without then harvesting your details so they can sell you something? (And yes, I know a login allows you to make personalised lists of resources – but that should be an optional extra, not a requirement.)

I’d like to make this. I think it would be useful; an evolving resource which any science teacher could use to find useful stuff. I’ve been thinking a lot about opportunity cost lately, and any time spent searching for resources, or reinventing a powerpoint about the motion of a wheel, is time that could have been spent on something better.

I’m not suggesting that time creating resources is necessarily wasted. We personalise what we do, we match it to students, we use it to clarify our own thinking, and we diagnose problems when we see how students (mis)use it. But what if you could check, once, if someone’s already done it?

What I’m imagining comes in two distinct phases. I put a smaller version of this together for Martin Reah when he was involved in a ‘Science SOW in a day’ last year. But if we wanted to do something larger-scale, I’d need significantly more help.

Crowdsourcing Phase:

  1. Get a domain and matched Google accounts so everything is in one place.
  2. Produce a checklist to describe and assess teaching resources. Part of this would be defined fields based on obvious criteria (type of resource, age group etc). Make this checklist – effectively a ‘markscheme’ – public, and adjust it based on comments from the eventual users.
  3. Issue an open invitation for submission of URLs to a GoogleDocs form. Each submission would require relevant keywords from set fields to describe the resource. For example an exam checklist might be tagged with 14-16, AQA, Physics, exams, pdf, CC-BY-NC-SA etc.
  4. Set a deadline or a threshold when a certain number of submissions have been received, and publicise the project as widely as possible.

Curation Phase:

  1. Find a half-dozen subject specialist teachers who are happy to spend a weekend together. Pay them overtime. Provide accommodation and food. Lock them in a meeting room with good ‘net access and lots of coffee. Have a computer technician who can troubleshoot as they review every link, scoring them according to the agreed criteria.
  2. Moderate a random sample of each teacher’s reviews. Ask them to suggest any useful changes to the checklist/markscheme. Every rating is based on teacher judgement.
  3. Make the spreadsheet freely available, or ideally build it into a website with the messy data behind the scenes.
  4. Return to Crowdsourcing Step 2 above.

This is a high impact approach with a minimal cost. By balancing crowdsourcing (where individual teachers do a small amount of work by submitting a favourite resource) and curation (where the time commitment means it needs to be paid properly) the strengths of both are acknowledged. The process is focussed on teachers using their professional judgement and being rewarded for it. If you think this looks like a good idea, you can help me out:

  1. Make suggestions of improvements in the method above. What’s wrong? What could be better?
  2. Share this post however you like so other people can make suggestions.
  3. Pass it on to people with budgets to spend on science education projects which can be open-access. As a community, we have the knowledge and the skills. What we don’t have is cash.