‘New’ Physics

I’m sure many other bloggers have posted about this already, but in case it’s passed you by; the new GCSE specification is officially starting from September. Many schools, of course, started teaching from the draft simple because, if you’re delivering GCSE Science over three years, there was no choice. For various reasons I’ve been looking at the AQA version in quite a lot of detail (as my previous post explained) and I wanted to share a summary I put together for the new content. The new material come from both directions, KS3 and A-level. It’s probably worth me explaining this.

Until now, some material was taught at KS3 (assuming you followed the national curriculum matched to the much-lamented SATs) and then assumed for GCSE. Some of this is now explicitly examined as part of the exam at 16. You could, of course, claim that once it’s been taught at age 13 it wouldn’t need to be revisited. Which, in my opinion, is daft. Other material has been taught as part of A-level for years, but hasn’t been part of the KS4 specification for years – certainly in my teaching memory of a decade or so. This will be a particular issue for schools which don’t deliver A-level, because they won’t have equipment or experience.

Energy: less emphasis on heat transfer and no mention of U-values. Note the use of the ‘new’ energy language (stores and pathways/processes) plus extra equations.

Electricity: a few bits of new vocabulary and slightly developed maths eg now explicitly includes P=I2R. Static electricity now includes electric fields, so you might want to try out the oil and semolina demonstration which is a nice parallel to iron filings around a magnet.
Particles: quite a lot of added material. This includes the idea of latent heat and the associated equation, which I don’t think has been taught to this age group since the days of O-level. There’s also lots on pressure in fluids (including gases) and the relationship between P and V aka Boyle’s Law.
Radioactivity: now includes neutrons as nuclear radiation, which personally I think is quite helpful. The vocabulary used distinguishes between irradiation and contamination (You may find this explanation helpful), but there’s less detail on industrial uses.
Forces: Lots added to this topic. Scalars and vectors are now explicit and students must be able to resolve forces at right angle using scale drawings. Levers has been extended to gears. Pressure includes both the equation for a column of liquid (this PhET simulation might help) and atmospheric pressure. The suvat equations are introduced with v2=u2+2as. Students need to be able to find tangents on d/t graphs. There’s new vocabulary to do with inertial mass. Not just the relationships but the identities of Newton’s Laws are needed, as well as a surprising amount of recall of ‘typical values’ such as reaction times, walking and running speeds and so on.
Waves: the sound and light content, previously at KS3, is now examined including mixing of colours and transmission or absorption by filters. Sound includes ultrasound uses. ‘Perfect’ black body definitions and uses are expected. This cheap wave driver might be useful for the required practical.
Magnetism: this includes all KS3 content but extends electromagnetism to an equation previously saved for A-level, F=BIl. The ideas of induced potential and the generator effect are also covered. On a personal note, I’d consider teaching the transformers material twice, once as part of electricity and once here.
Space: many teachers are disappointed that this topic is reduced – and completely missing if students do ‘double’ aka Trinity rather than separate sciences. I’ve always found it a topic which engaged weaker learners due to the big ideas and lack of scary maths, and now they won’t get to see it.
Hope these links are helpful – please comment or email if you have better suggestions or any other thoughts.

 

Data Analysis Questions

As I mentioned in my previous post, I’ve recently been doing some freelance work in a local school. The role is short-term and has an interesting mix of aims, but one part is to work with Year11 students on data analysis questions. Now, obviously I’ve taught these skills before. But I’ve not previously used the OCR B specification before, which features a final data question worth ten marks. I know this is running out soon but thought it might be worth sharing what I’ve created.

Firstly, a plea to all exam boards. When you release Examiners’ Reports – which are really useful, please keep doing it – can you combine them with the markscheme for easy reference? It’s something I’ve done for a while but it would make much more sense for you to do it.

2014

2013

Specimen

Predictably, the specimen paper isn’t a great example to use. I’ve not included the 2015 paper because many schools will be using it for preparation in controlled conditions. The links above are to my own copies in case OCR rearranges their site with the new specifications, and I’ve added the Section D page details to the filenames to make life easier for colleagues.

It seems a good time to remind you all that in the past I produced quite a few resources for looking at past exam papers, mostly AQA. The tags on the right should make it fairly easy to find them.

When we used these in class, one of the outcomes was that students put together a list of “things to try if you’re stuck”. Now, for many pupils this will have been built in to their teaching, but we all know that kids don’t always absorb what we’re hoping they will. I think the real value of this is to generate a list with your own students, but for your interest:

  1. Highlight or underline numbers in the question
  2. Draw lines from the axes at specified values so you can find the corresponding value
  3. If the question is about differences, you’ll need to add or subtract
  4. If the question is about rates or uses the word ‘per’, you’ll need to divide or multiply and you might need to think about gradient or slope

Comments and suggestions welcome, as always.

 

 

Energy Stores and Pathways

Tonight’s #asechat will involve Charles Tracy, the IoP’s Head of Education (and one of my bosses), discussing the new approach adopted by exam boards from this year. There’s lots of information at Supporting Physics Teaching, which is free to access and needs no sign-in. Other sites and resources will hopefully move over to this terminology (BBC Bitesize already has, for example). But why should we bother?

Energy is one of those topics, isn’t it? We teach it several times, but the kids seem to hang on to their misconceptions. Partly this is because it’s a word which is used in everyday life, often interchangably with power. Partly it’s the way students get mixed up with energy ‘resources’ (or as I prefer to teach it, ‘ways to make electricity’.

We shouldn’t be surprised that this causes problems. Energy is at heart a very abstract concept, and so one which is difficult for students to grasp. Does it make things happen? Well, not always – and this leads to students confusing energy with force. I used to divide the ‘types’ of energy into potential and moving categories, which I suppose could be seen as a crude version of this new approach.

In the simplest possible description, energy is about bookkeeping or currency. It turns out that when objects interact, often via forces, then we can do some maths which describe the change. What’s interesting is that if we pay attention, then the same number comes up more than once. This tells us that something is conserved.

We call that something energy and say it has been transferred from one place to another. Calling those places stores emphasizes that they still have whatever they were given. This sounds similar to past approaches but avoids the idea of distinct ‘chemical energy’ being turned into ‘electrical energy’ and so on. SPT has a good comparison.

So we teach energy concepts to make it easier to do calculations. We can’t measure energy directly, but the equations we use allow us to make measurements, which allow us to make deductions, which in turn allow us to make predictions.

That sounds a lot like science, doesn’t it?

Energy moves from one store to another via pathways. These are actions – verbs, if you like – which describe a change in a system. The IoP is suggesting using the word shift rather than transfer. (I would suggest one good reason to do so is to avoid the mix up with transform, which suggests there are different kinds of energy.) I found the diagram of possible pathways at SPT useful.

Several approaches are possible, including taking a ‘snapshot’ before and after an event, or showing the amount of energy in each store with orange liquid. There are of course others, many of which are visual and so provide an anchor for students to observed reality. This isn’t to recommend VAK of course – only to suggest that making this concept ‘stract’ can only be a good thing.

I’ll be taking part in the session this evening, and I’ll add a link to the archive afterwards. I’m sure there’ll be an advert for TalkPhysics, which is one place to get access to ongoing advice and support on this and other approaches. It may be short notice but please pass on the link for tonight’s chat; the more the merrier.

Doing Physics

A recent Guardian blog was from a 16 year old who felt that Physics at A-level had little to offer her. Sadly the Guardian weren’t interested in the response, so I’m posting it here.

It’s a basic principle of science that anecdotes are not data. Sadly the personal story shared by Sarah is one example supported by wider evidence. There are undoubtedly many reasons why students, male and female, drop physics at sixteen. Things are better than they were, since the low point in 2007 when less than 28000 chose it as an A-level subject. But female students still make up only 20% of sixth form physics classes, despite GCSE results that are as good or better. This is frustrating for students, for teachers and certainly for politicians.

So why should anybody, male or female, choose Physics for post-16 study? The reasons are the same as for any subject; for interest and for usefulness. I can’t imagine not finding physics fascinating, but then you could argue I’m one of the success stories.

I start the school year by turning out my pockets and challenging students to recognise the science implicit in our lives. It stretches from the metallurgy of my keys and wedding ring to drug trials for painkillers, from the link between the shape of my lenses and my prescription to the magnetic coding on my credit card. And that’s before we consider the many facets of mobile devices, from electronics via touchscreen engineering to the EM spectrum and orbital mechanics for the satellites that carry the signals. Science really is everywhere, physics certainly as much as biology or chemistry. From the big, abstract picture to the uses we take for granted day to day, physics is mind-blowing.

In practical terms it’s also a hugely useful, facilitating subject even if you don’t plan to use it directly in the scientific, medical or engineering worlds. Yes, rocket scientists (actually usually engineers) need physics. Yes, it provides an important grounding for medicine. But the skills you learn provide many other benefits in a wide range of courses and careers. When able students choose other subjects we as teachers inevitably feel we missed making that clear enough. Sometimes students making A-level choices don’t appreciate that the courses are a stepping stone, not an end in themselves.

There is a big imbalance in the number of male and female students who choose Physics at A-level. This is not new, and it’s not going away by itself. I think – and more importantly, the data shows – that there are several possible causes worth considering. Unsurprisingly, some of these factors are more difficult to address than others. Many subjects have a gender imbalance, some much worse than physics, but as a physics teacher I have a personal stake. I often describe changes in education happening at different levels.

Nationally, there are some really big issues affecting education across all subjects. Representations of scientists in the media are improving, but Brian Cox isn’t the only reason students choose Physics. The Wellcome Trust raised many issues in their 2011 report about young people’s views on science education. Programmes of study and the exam specifications need to be considered for their impact on a range of diverse students. The type of school makes a difference – although this is nothing to do with academies or free schools. Students with attached sixth forms make up more balanced classes. Girls are more likely to choose physics in independent schools, especially if they are single sex. These findings, along with several of the other links, form the backdrop to ongoing projects at the Institute of Physics to improve UK Physics education. There are often other political choices to be made, from funding of teacher training to rebuilding school facilities. The Royal Society recently published their Vision for science and mathematics education, This is ambitious and far-ranging, considering how we might develop teaching of these subjects over the next twenty years.

School leaders and governers need to consider what affects student choices for A-levels across subjects. The evidence, despite claims to the contrary, suggests that the rapport between teacher and student is generally much more important than the gender of the teacher. Having specialists teaching physics well to younger students also makes a big difference. A school with no Spanish teacher has the option to offer other languages instead, something that doesn’t apply to the sciences. Of course local authorities and academy chains make choices at this tactical level too.

And I can change things in my classroom, with my students. I can ensure examples and textbooks feature male and female physicists. I can make clear links to social implications of the physics we study, something which has been shown to improve engagement for all but girls in particular. I can point out when individuals or the class are making assumptions; for example in a recent question describing the movement of a skydiver, 22 out of 28 in the group used male pronouns for no reason they could explain. I can try out different arrangements of practical groups so boys don’t dominate the hands-on aspect. These aspects are about good teaching methods. At the same time they’re hugely important and completely overwhelmed by the bigger picture.

If I were Sarah’s teacher, I would tell her that Physics is hugely relevant to daily life and always will be. It’s a beautiful subject with fascinating implications. It is a vital part of many careers and studying it provides many future options. I would never criticise a student’s choices – it’s their life, not mine – but I hope their decisions are a truly informed choice. A lot of teaching is helping students to overcome their misconceptions. I hope that we as teachers can do a better job of offering that informed choice to more students across the UK.

AQA 4/6mark Qs

The shortest post ever (to make up for the 1500word epic of the weekend): I’ve organised AQA questions from past papers with markschemes and examiners’ report comments. The 16 pages of this .pdf have the 4 and 6 mark questions at the front, followed by the relevant marking guidelines and what the examiners had to say afterwards. Last minute but possibly useful today?

6 mark Qs blog as .pdf

Core Physics revision sites handout

This second post in a day will be even briefer than the last. After complaints from my Year 10 students that they couldn’t possibly be expected to find good websites by themselves – yes, I know – I produced a quick handout listing a few URLs and comments for them. I was going to put it on the VLE, but realised it would be much more likely to be used if they had instant access, so added QR codes and gave them printed copies. Of course they were very appreciative for me giving up my break this morning to make this for them.

Stop laughing.

Anyway, here it is as a pdf. It’s got two identical pages because that was the fastest way to print off A5 versions, although it does mean there’s a bit of wasted space.

revision sites pic

Now, as this has quite possibly saved you a few minutes, I have a request to make. Use two of those minutes to add to my portfolio. Simply follow this link and tick a few boxes, no names necessary, so I can show how what I do helps people outside my immediate school. Many thanks.

Waves Revision (AQA P1)

Another quick one, but hopefully useful for those helping students prepare for GCSE Physics; our specification is AQA and the exam is P1, but I hope it will be more generally helpful than that.

waves bestof3

Download waves bestof3 as .ppt

Starter: Choose three words to define

You could have students write down their ideas, include some hints or simply Think/Pair/Share. I like to have one student share their idea, then have another try to improve it, or say what’s good about it. The words are in alphabetical order but you could easily differentiate this activity explicitly if preferred.

Main1: Best of 3

Each slide shows three possible statements or answers to a question. I give students a minute to choose a particularly good or bad answer by discussion. They must be able to improve it and I then ask for suggestions before moving on to the solution slide.  They do not all have one good, one indifferent and one bad answer. There are obvious links to grade progression here and you could use mini whiteboards to ensure all are involved.

Main2: Drawing diagrams

By now students should be seeing these points as a reminder, hopefully ideas they’re familiar with from thorough and careful revision cough cough. Based on their answers and difficulties I would then split them into groups to practise individual elements, from rehearsing fundamentals to more challenging diagrams. I’ve credited the sources of the diagrams, all CC-licensed I think.

Plenary: umm…

I’ve not included one on the powerpoint but returning to key definitions would seem a good plan; ask students to state something they understand better now than they did at the start perhaps? Alternatively finish with a past paper question so they can demonstrate what they are now capable of.

 

Before You Go…

As usual, if you find this resource useful, or adapt the idea to your own teaching, I’d really appreciate you taking a moment to add to my portfolio. Simply follow this link and tick a few boxes, no names necessary. Many thanks.

Heat Misconceptions

Like many of us, I’m currently spending the majority of my time helping students prepare for external exams. Because of how science exams now work in secondary school, most of my classes are facing one or more exams in the next few weeks, just for physics. Seven classes are doing GCSE content (2 x Yr9, 3 x Yr10, 2 x Yr11) and two classes are in sixth form.

Something I’ve spent a little time on has been prompted by the variety of answers to mock questions on heat transfer. It was clear that many able students were struggling with clear explanations – and perhaps understanding – of mechanisms of the transfer of thermal energy, as demonstrated by Qs 4 and 5 on the AQA P1 June 2013 paper. So I looked into it.

Examiner’s Reports

My first step was to check whether this was an isolated case or something seen for these exam papers when originally sat. I strongly recommend all colleagues, if they’re not already familiar with it, find where they can read the reports written after the exam for the benefit of teachers and exam boards. They’re available (delayed) for pupils too, but with AQA you need to go through the main subject page rather than to the quick ‘Past Papers’ link.

…nearly half of students scored two marks or less. Common mistakes were referring to ‘heat particles’, thinking that the vacuum stopped all forms of heat transfer, thinking that the vacuum contained air and referring to the transfer of ‘cold’.

…Students who referred to water particles often mistakenly referred to them ‘vibrating more’ as a result of the energy given, or to the particles themselves becoming less dense.

From AQA P1 June 2012 Report

So it wasn’t just my kids.

Now What?

I think of myself as a fairly evidence-based practitioner, so next I wanted to check out some wider sources. A quick search for ‘physics misconceptions heat’ has a large number of results, including one from more than 20 years ago which shows how established the problem is.

As a science teacher, Physics Education from the IOP and School Science Review from the ASE seemed a good place to look. Unfortunately both require memberships, a problem in terms of cost which I’ve blogged about before. Students’ misconceptions about heat transfer mechanisms and elementary kinetic theory is relevant, as is this resource available without login on the ASE site. R Driver’s book Making Sense of Secondary Science was one of several recommended during an #asechat “What misconceptions do students have in science?” in 2011.

I used the students’ answers as a way to diagnose the ‘alternative conceptions’ that they had built up over time. For many these had clearly been established long before my arrival, but I’m going to build some of the ideas into my next cycle of teaching for early intervention. Some of the points from Cyberphysics UK and PhysicsClassroom.com were also useful. What I produced – firstly as a scribbled list, then as a more formal activity, was the ‘Seven Sins of Heat Transfer’. In time I’d like to produce some confidence grids and link these to the diagnostic questions approach as explained at York Science. Concept cartoons with clear viewpoints let students explore different models without ‘owing up’ to ideas they think are wrong, which can be very helpful. And so here’s one of the great @DoTryThisAtHome cartoons:

 

Seven Sins of Heat Transfer

  • Heat rises
  • Particles of heat
  • Expanding particles
  • Shiny materials are good conductors
  • Cold gets in
  • Condensing and contracting are the same
  • Trapped particles can’t move through a vacuum flask

These are what I wrote while marking papers; I’ve just removed the profanity. My reading showed me that some were common alternative conceptions, while others demonstrated a poor understanding of technical terms, often made worse by persistent misuse in ‘everyday’ language. A bit of thinking, and more reading, helped me find ways to highlight these issues for students.

Printable version with prompt Qs: 7sins as .pdf

EDIT: I shouldn’t have needed prompting, but CathN suggested in the comments that model answers would be useful, particularly for non-specialists. And so I’ve put together a presentation going through each of the sections, explained more or less the way I would in class. Obviously colleagues will have their own thoughts and preferred analogies, but I’d love comments on possible improvements; simply click on the title slide below.

7sins

Alternatively: 7sins as .ppt

When time allows during revision, and certainly next time I teach this content, I’ll be linking these misconceptions explicitly with practical activities. I think I’ll also ban the use of ‘heat’ by itself. If students are forced to use ‘collisions between touching particles’, ‘energetic particles in a lower density region’ and ‘thermal radiation’ then we should be able to solve the sloppy language issue, at least.

Thoughts and comments on this very welcome; it strikes me that I could usefully spend time producing a series of lessons and resources on just this sort of thing. Exam question followed by diagnostic questions, circus of activities to highlight misconception, then applications of correct idea to new situation. So if anyone wants to pay me, well, you know where I am…

In the meantime:

I’m trying to track my impact (eg you using this resource or basing your own on my ideas). You don’t have to leave your name, just a few words about how what I did made a difference. If you’ve blogged about it, I’d love for you to include a link. Tweets are transient, comments on the posts are hard to collect together, but this would really help.

Blog Feedback via Google Form

 

Current Electricity and Revision Thoughts

It’s that time of year, but I’ve not been able to post much about revision lessons and activities because I’ve been too busy doing them. And because of other projects, too. So my apologies for the long absence.

P2 electricity quick ref (as pdf)

This grew out of activities trying to help students make clear links between past questions and revision content. It was intended to be a fast way for them to check details (using the QR codes, which link to websites including BBC Bitesize and My GCSE Science) without getting bogged down in minutae. Time is short with Year 11 and this kind of approach should work well with revision classes, allowing self-directed study which you can then explain when they visit for extra sessions – I combined it with some relevant questions, broken down by topic.

Having students creating something like this would also work well. I’m going to try giving them an electronic blank with four spaces to write their own questions, but insist they add links to different resources which contain the answers to each of the four.

When revising, as usual I’m asking students to focus on active rather than passive techniques. A recent activity challenged them to suggest ways of turning common but less engaged methods into more dynamic ones.

Not Just Reading

It’s very telling when a student is asked how they revise, and respond with ‘looking at the revision guide’. Simply reading is too passive, but the use of looking suggests even less engagement. We came up with:

  • Pause to write summary sentences or bullet points
  • Highlight/underline key words, practise definitions
  • Cover/copy/check
  • Convert format to revision cards (paper or electronic), mindmaps or similar
  • Write questions (split between recall, explanation and mathematical) linked to content

Questions

Practice questions are of course a very useful way to prepare for exams, even if the focus inevitably turns to exam technique rather than understanding. I’ve blogged before about useful variations but most recently have been relying on:

  • BUS structure (from Twitter, can’t recall source) where students box command word, underline key points in question and scribble additional vocab to include
  • Write three hint words and pass to a classmate who has to use those words
  • Write an alternative question (convert maths Qs to words and versa vice) testing similar content
  • Produce a deliberately mid-level answer and add commentary for how to improve

Videos/Podcasts

The links in the worksheet include one to the video archive, Khan Academy style, of My GCSE Science. Some of these have built-in pauses but even if not, I’m encouraging my students to use a very specific format which also works for audio, such as the Naked Scientists podcasts hosted at the BBC.

  1. Write title and spend a couple of minutes bullet pointing what you think will be in it.
  2. Watch/listen to first few minutes, then pause.
  3. Tick what you were right about, adding details/examples where needed, and add main points you’d not remembered.
  4. Bullet point what you think will be coming next.
  5. Next few minutes, then pause and repeat.
  6. Once finished, attempt a question relating to the content, referring back to notes if needed.

One Hour to Success

It’s amazing, as usual, how many seem to think that putting their phone to one side is unreasonable while revising. I suggested to several parents recently that phones should be given to them during an active revision session in exchange for tea and biscuits

  • 0-15 min: active revision using methods above
  • 15-20 min: break, with cuppa, parents looking at written work while student texts their mates, then returns phone
  • 20-35 min: attempt and mark a past paper question on revised content
  • 35-40 min: second break, student loads dishwasher (including used mug) while parent looks at the exam answer
  • 40-55 min: worked examples and further practice of weak areas as identified, or simply learning vocab that’s relevant.
  • 55-60 min: write title of next revision priority on a new sheet of paper, ready for next time, placed in revision guide at relevant page.

I wonder how many will stick to it…

Portfolio

I’m trying to track my impact (eg you using this resource or basing your own on my ideas). You don’t have to leave your name, just a few words about how what I did made a difference. If you’ve blogged about it, I’d love for you to include a link. Tweets are transient, comments on the posts are hard to collect together, but this would really help.

Blog Feedback via Google Form

 

A Day in The Life

So I tweeted…

…and then I got some replies. It wasn’t a survey. It wasn’t particularly scientific. But I did think it cast an interesting light on the variety of science teaching. The joy of Twitter is that I was able to check permission (and Yes, I agree it’s a public medium but it also seemed polite) and invite longer comments by email. I’ve not had any of those, completely understandable as everyone’s busy with the end of term rush, but here we go anyway.

I suspect mine needs little explanation. Surely we’ve all used ‘martian landers’ to get kids thinking about forces and parachutes? Lots of great videos as starters and many briefing sheets, like this one from TeachEngineering. Before introducing momentum as a term I get kids to consider how unstoppable moving objects are, as they find that language much more accessible. And giving them the two contradictory facts that beta particles are electrons and there are no electrons in the nucleus is always fun.

 

I wonder how @90_maz changed the teaching of the EM spectrum to suit different classes?

That is indeed varied! I always find classifying an interesting topic to teach but find myself getting bogged down in (fascinating) detail about bats and dolphins if I’m not careful.

The joys of behaviour management… trying to pay attention to potential issues without them feeling they have to play up/down to your expectations.

I find this a really useful approach, but would be a lot easier if I had wifi access or a webcam of some kind. Preparing three paragraphs in advance and asking students to identify strengths and weaknesses, and which belongs to the teacher, is often worthwhile. If I was brave enough I’d record audio of me talking myself through the problem so they can hear/see me ‘thinking out loud‘.

Another varied day – sometimes I wish I was immune to yr8. I’ve never taught the EMPA but would be really interested in viewpoints. Of course, it won’t be long before it all changes again; you might have seen the letter from SCORE on practical assessment, but I’ve not tracked down anything published by OfQual yet.

A great example of how teachers do extra work – effectively unpaid overtime – which is effectively invisible to the wider world. We’re all familiar with working in the evenings, weekends and through holidays, but how many of us have also worked while off sick or on maternity leave?

A really interesting snapshot and I’d value any further detail, from the above or anyone else.