Saturday, 13 April 2013

National Curriculum Consultation

I've finally finished my response to the National Curriculum.  It took quite a while but I'm glad I've got it done.

I think that it is really important that teachers, and others with an interest in Education, respond to the consultation.  I know that the subject bodies and others (such as the Institute of Physics, Royal Society of Chemistry, SCORE, ASCL, DATA etc) will submit their own, probably more detailed versions.  However, I think that it is good for Mr Gove to know that 'real' teachers (as opposed to the Blob) are paying attention.

I also think that it is more important to respond to the official consultation than to sign any amount of petitions / letters etc.  These may have a feelgood factor that the official consultation doesn't have, but they don't necessarily show that people have thought deeply about the issues (though they no doubt have).

If you are interested in what I have answered, I've included my answers below.  In responding to the consultation I tried to read what others were responding - especially in subjects other than science.  In at least one case I have borrowed heavily copied a response because I thought it was very good.  However, I did reference my source!

Subject Associations etc:
ASCL statement
DATA response (pdf)
PSHE Association

I am particular grateful to Helen Rogerson for her sterling work comparing the old and new curricula.  It made getting my head round how things were changing much easier.
Her blogpost and thoughts are here.
Ben Preston has also shared his thoughts, and you can find them here.

Here, if you are interested, are some of my answers.
Q1. Do you have any comments on the proposed aims for the NC as a whole set out in the framework document?


The aims are currently broad and somewhat nebulous, and would benefit from greater clarity.  The aims as currently written are more of a description of what children will be able to do, not what their education should aspire to.  Michael Reiss, from the Institute of Education, has co-authored a book in which he addresses the aims of a curriculum, and I suggest that the department would do well to consult further with Prof. Reiss on how to develop the aims of the National curriculum further.
However, I think that it is helpful that the NC provides an outline of core knowledge for teachers to use to develop “exciting and stimulating lessons”.  As you state in section 1.17 “…we are aiming to give teachers more space and flexibility to design their lessons by focusing only on the essential knowledge to be taught in each subject”. This is an admirable aim. However, I think that the Programmes of Study that follow this statement (especially for primary subjects) contain far too much content to realistically allow this to happen in schools.  The specified content should be reduced to allow for personalisation of the curriculum in each school, and to provide teachers with the autonomy in the development of their teaching that has been promised.

I would also like to see reference to skills and processes that children are introduced to through the subject content.  These are mentioned in the Attainment targets (know, apply and understand the matters, skills and processes), and so their lack in the aims of the curriculum is surprising.  The emphasis on knowledge could, in some subjects (especially science) lead to a reduction in the development and use of practical work which would be a great pity.

I think that it is good that your aim is to embed numeracy and literacy throughout the curriculum, and that sometimes this is not realised in the proposed programmes of study.  Also, it would be good if science, as one of the three subjects which you are focussing on, could also be embedded in English and Maths with scientific texts to read, or topics to discuss, or maths as applied in a scientific context.

Q2 Do you agree that instead of detailed subject-level aims we should free teachers to shape their own curriculum aims based on the content in the programmes of study?

The aims of the subjects should be elucidated before decided on the content of the programme.  To ask teachers in individual schools to make up their own aims from the content which has already been decided is not a particularly helpful thing to do. As this is a National curriculum, then one must assume that the subject aims should be nationally coherent as well as coherent with the aims of the curriculum as a whole.  This is unlikely to be the case if all teachers are creating their own curriculum aims.
With reference to the aims for science specifically.
Given the interdisciplinary nature of science nowadays, I think that it would be better if the aims were reworded to reflect the growth in interdisciplinary studies such as biochemistry, medical physics and cognitive psychology. Also, the splitting of science into Chemistry, Physics and Biology does not reflect how science is taught in many schools where most students, from year 1 up to year 8 or 9, will be taught Science. 

Q3 Do you have any comments on the content set out in the draft programmes of study?
There is a great disparity in the content, layout and level of detail across the different draft programmes of study.
I am aware of the perceived importance of English, Science and Maths and hence can understand why programmes of study have been provided in such detail at KS1 and KS2.  However, I think that the level of detail should be reduced to allow schools to develop their curriculum more freely. 
In the primary curriculum I dislike the year by year format.  I think that this will be too restrictive, and although the additional information does suggest that teachers do not have to stick to this timeplan, it is likely that it will become the de facto order (in a similar way to the QCA schemes of work).  I think it would be better to stipulate content for KS1 and KS2 each as a whole.   
Whilst the aims of the History curriculum are good, the vast scope of history that you are expecting students to cover in 3 or 4 years is too large.  It would be better to suggest possible eras to cover, rather than ALL of them.  I agree that having more of an understanding of the chronology of history would be a good thing and should underpin students’ study of history, but there needs to be more flexibility in exactly what specific episodes of history are taught.  I also think that in an increasingly multicultural society, and in a world in which it is imperative that young people are able to work cooperatively with other nationalities, there is too much focus on the British Isles.  This is a missed opportunity and should be rectified to allow world histories (that aren’t white british) to be studied where appropriate.
I am unsure about the wisdom of making the study of a language at KS2 compulsory.  I feel that it could be difficult to find appropriately qualified staff, and would provide difficulties in continuity when students move from Primary to secondary schools.  However, I think that it should be highlighted as a suitable optional subject in primary to enrich the curriculum in schools where this is appropriate. However, I quite like the idea of latin or ancient greek being available, and think that the government should fund the development of suitable primary curriculum materials to support the introduction of these languages if a school wishes for it.

Physical Education
The introduction of a variety of different sports and activities (many of which are not necessarily competitive) has benefited students who are not interested in competitive sports.  Activities such as trampolining, karate, gym, fencing and dance (of various kinds) allow students to enjoy a healthy activity without needing to compete.  I think that it is a shame that it feels like there is such an overt focus on competitive sports in the draft programme of study.

Design and technology
Given the current complexity of electrical and mechanical systems I think that the following statements are unrealistic:
  •   electricals and electronics: to carry out common diagnostic, maintenance and repair tasks on electrical and electronic appliances, and plan, design, make and evaluate simple electrical or electronic devices
  • mechanics: to undertake common diagnostic and maintenance tasks on mechanical objects such as bicycles and motor vehicles.
Many electrical and electronic appliances manufacturers discourage owners from repairing these objects.  In fact, even changing/wiring a plug is generally not easily done with devices sold with moulded plugs already attached.  Likewise, the maintance tasks would be limited to filling screenwash, pumping up/changing tyres or possibly changing the oil on many motor vehicles.  I am unsure of the value of this in the curriculum.

The D&T programme of study contains terms such as ‘common’, ‘simple’, ‘straightforward’.  This does not feel like an aspirational PoS which will introduce students to the ‘best that has been thought and said’.  A number of schools have been investing in 3D printers (with government funding), and there appears to be little place for these in the draft PoS.  I am also unsure of the value of including ‘horticulture’ here, as it includes neither design nor (in any great extent within the school context) technology.  Whilst I feel that it is important that students are aware of where their food comes from a better place for this would be within the science programme of study. 

Science
In science the different programmes of study do not feel like a coherent whole.  They appear to have been developed in isolation and don’t necessarily allow for progression of ideas through the years.  There is also overlap in some topics at KS3 with e.g. matter being in both Chemistry and Physics covering the same knowledge. This needs to be rationalised into one place, or ensure that the topic is not repeated.

There appears to have been a movement of some topics down key stages and this is not helpful.  The reduction in Earth Science and astronomy is a shame – although making decisions about what to leave out is difficult.

There is a lack of coherence between the mathematical requirements and the science requirements so that the development of maths skills will not support those of the science programme.  The writer of the ‘Working Scientifically’ section should also make reference to the ASE publication ‘The language of measurement’, where they would find that ‘reliability’ is not a term recommended for use in school science. Nor is it endorsed by the awarding organisations, all of whom refer schools to the aforementioned ASE document.

I think that including notable stories about scientists and inventors is an admirable aim.  However, by concentrating on historical, mainly white, mainly male figures, you may confirm in students’ minds that science is not for them.  It also misses the opportunity to make use of the good work of STEM ambassadors, and the Research Councils.  It would be fabulous if these, and other, bodies were able to support teachers to make links with current scientists who are ‘developing useful new materials’, scientists involved with ‘classification’, ‘palaeontologists’, ‘naturalists and animal behaviourists’, scientists who have helped develop the ideas of the solar system and so on.  In each case there are scientists, engineers or designers in UK universities and companies who could be used as case studies (and aspirational careers examples) for young people.

KS1 does not include much ‘physics’ e.g. no electricity or magnets and even more limited chemistry.  This narrower range could potentially impact on the amount of science children do at KS1, compared to that done currently, and has raised concerns over their preparation for KS2.

Chemistry
In the year 2 notes and guidance it says ‘spoons can be made from plastic, wood, metal, but not glass’. However, I would recommend the writer types ‘glass punch spoon’ into their search engine of choice where they will find numerous examples of glass spoons.
Chemistry appears to be limited to identifying materials a lot in KS1 and KS2 and needs to be looked at to ensure that the balance is better.  What children are expected to be taught – particularly about the properties and uses of materials – differs little in each of the years.

The layout and structure of the Chemistry topics at KS3 are very different from those of Physics and Biology and I think that there should be more uniformity where possible.
I am unclear what ‘the chemical properties of metals and non-metals and metal and non-metal oxides with respect to acidity’ means, and this should be clarified for non-specialists.

Physics
The teaching of refraction at KS2 (notes and guidance) is not suitable at this age.
The section on Energy is very different from previous energy discussions.  I think that the writer of the draft PoS should make more use of the discussion of energy found in the Institute of Physics Supporting Physics Teaching 11-14 materials, as well as the recent paper from Professor Robin Millar ‘Towards a research informed sequence for teaching energy’ , 2012.  The concept of ‘auditing change’ by calculation would be better in KS4 when the students would meet and carry out appropriate calculations. The introduction of kW before students have studied power is unhelpful.  It would be better to start out by considering fuels (possibly through energy values in food leading to fossil fuels etc).  Also, as an examiner, I feel that it would be difficult to develop a wide variety of assessment items that would successfully test an understanding of some of the examples of processes that cause change at KS3.

Magnets year 3 – in notes ‘Note: Pupils do not need to be introduced to ‘like’ and ‘unlike’ magnetic poles until Year 5’. However, this is probably a helpful discussion to explain why magnets can both attract and repel each other so this note is not appropriate.

Year 5 Earth and Space – The notes in the guidance about the solar system does not appear to relate to the PoS and would be better in KS3. Also, I think that it is beyond  students (and teachers) to work out how places such as Stonehenge are used as astronomical clocks.  This seems quite a large ask – especially as the exact use of such places is still debated amongst archaeologists.

Year 3 Light – It is unlikely that many schools will have the facilities to take a class of 30 children safely into a completely blacked out room.

Year 3 Rocks – This topic appears from nowhere, and appear to go nowhere in the rest of the NC.  There should be a more coherent Earth story throughout KS1-3.  In the notes and guidance the use of hand lens to look at whether rocks contain grains or crystals which is probably too difficult at this level.  It would be better to limit KS1 to looking at different types of rock, investigating rocks (and other building materials) in their locality.  Any in depth treatment should probably be limited to sedimentary rock at KS2 (linked with evolution and fossils perhaps), with igneous and metamorphic treated properly at KS3. 
Year 4  States of Matter.
There is a contradiction in the guidance in that teachers are told to avoid changes of state associated with baking or burning, but then suggested to look at making biscuits (which would potentially involve baking).
The water cycle appears anomalous here and is a difficult topic to include.  It would be better to relate evaporation and condensation to weather patterns, rain, snow, ice etc without referring to the water cycle.

KS3 Waves – the concept of superposition is a difficult one and would be better in KS4. Would also be good to see a reference to other models of waves for transverse waves (such as the jelly baby wave machine), or remove specific reference to a slinky.  Echoes and reflection of sound should be included. 
At KS3 it would perhaps be better to refer just to ‘light’ rather than ‘light waves’ as electromagnetic radiation can obviously be both a wave and a particle.

Year 4 Electricity. The notes contain the sentence ‘some materials can and some cannot be used to connect across a gap in a circuit.’  However, all materials could be used to connect across a gap in a circuit; it’s just that some will be conductive and others not. The sentence needs rewording to clarify the meaning.

KS3 Static electricity.  This would be better in KS4 I think, especially as students do not appear to have been introduced to electrons in the Chemistry section at KS3.

KS3 Forces and motion
The phrase ‘torque and rotational effects’ is very wide, and I think that explaining rotational effects is too difficult at KS3 (or even KS4). Rotational dynamics is a difficult topic best covered beyond A-level.
It would be good to include the concepts of force arrows, drawing forces on a diagram, adding forces in one direction, net forces and balanced forces at KS3


Biology
I support the Sex Education Forum’s response to the National Curriculum consultation setting out that the revised National Curriculum must ensure that all children and young people are entitled to a comprehensive and developmental programme of sex education through science.
I recommend that: The science curriculum adopts clear, open language and a positive tone for content relating to human reproduction, growth and sexual health. This is essential to make it clear to teachers, parents and pupils what will be taught. This means that:
  • the term puberty should be used in primary science and the retrogressive note stating 'they should not be expected to understand how reproduction occurs' should be removed;
  • at KS3 the current content on sexual health and disease, contraception, and adolescence should be retained, and learning about hormones should be included.
Because the only statutory requirement for primary school sex education is within National Curriculum science, it is essential for safeguarding and well-being that the programme of study makes clear that:
  • children can name external genitalia at Key stage 1;
  • and learn about puberty before it happens i.e. introducing the idea at Lower KS 2.
As there is no other requirement for primary SRE, science should reflect the current Sex and Relationship Education Guidance (DfEE 2000), which recommends that SRE:
  • ‘should ensure that both boys and girls know about puberty and how a baby is born.’
    On harmful substances:

    I also think that the Government should include specific references to the safe and responsible use of chemicals, including medicines found in the home and specific references to the effects of alcohol, tobacco and volatile substances on the body's systems in Key Stage 1 and 2.  There should be specific references to tobacco, volitile substances and alcohol at Key Stage 3 as promoted by leading drug education charity Mentor.


Q4 Does the content set out in the draft programmes of study represent a sufficiently ambitious level of challenge for pupils at each key stage?

Given the differences in the level of specificity and detail in the different programmes of study this question is impossible to answer as a whole. 

In some subjects (especially in primary e.g. History, Maths and English) the level of challenge is extremely high, but in others (particularly D&T or Citizenship) it is vague and does not appear to be an improvement on the current curriculum.

Also, the level of challenge will depend to an extent on the external assessment, and these are not available as yet.


Science:
There are some instances where the level of challenge is less than in the current curriculum, especially at KS1, and some where the content is too challenging as the children will not have done precursory work.
In a few areas the KS2 content is more challenging than KS3, for example the younger pupils are asked to tackle gravity, space motion, and evolution. There is a jump in the language used from KS2 to KS3 e.g. the use of terms, such as "fair test" in the primary content, jumping to the term ‘experiment’ and specific knowledge of variables.

There are some topics in KS3 which would be better in KS4 (see answer to previous question for examples).
 
Q5. Do you have any comments on the proposed wording of the attainment targets?

They should be tailored to each subject much more to allow for judgement about the achievement of students in that particular subject. 

Whilst I am happy with the removal of levels, little detail has been provided to guide teachers and school leaders about how progress will be judged using the draft NC.  This is unsettling, and should have been presented at the same time as the draft.

Q7 Do you agree that we should change the subject information and communication technology to computing, to reflect the content of the new programmes of study?

Whilst I welcome the inclusion of some computing in the curriculum, I think that the loss of ICT in some form is a shame.  The proposed computing to be included is very technical.  There needs to be a balance between an understanding of how computers work and how to program them with the use of computers in adult life (word-processing, spread sheets, web design, digital images etc).  This does not happen in the current draft curriculum, and needs to be revisited.  Also, although online safety is mentioned early in the curriculum it should be included at secondary, as students access a wider range of material and begin to be involved more heavily in social media.

There is also a strong need for CPD for teachers to help the delivery of any new computing curriculum.

Q8 Does the new National Curriculum embody an expectation of higher standards for all children?
A change in the curriculum alone will not bring about higher standards for all children. Without a coherent approach to teacher support, assessment, accountability and assessment the response to the national curriculum (assuming schools decide to implement it) will be limited.


The draft Curriculum is more content-heavy in some areas, especially in the core subjects in primary, but harder content will not necessarily lead to higher standards of achievement. It could have the opposite effect by alienating some students who are currently engaged. In a number of subjects the content appears repetitive and an increasing level of demand is not clearly expressed - this might actually drive down standards
Q11 What key factors will affect schools’ ability to implement the new National Curriculum successfully from September 2014?
I cannot see how schools will be able to implement the new NC successfully from September 2014.  Whilst I think that it is a good idea to review the whole of the curriculum together (rather than piecemeal as has been done in the past), this, coupled with the changes to assessment at GCSE and A-level all converging on the same timeframe, means that every year of the curriculum will need to be reviewed, and possibly rewritten in a timescale of less than 18 months.  An impossible undertaking.  Of course, it may well be that Academies just don’t bother and focus on the assessment changes, but that still leaves primaries and non-academies with a huge change.


Q13 Do you agree that we should amend the legislation to disapply the National Curriculum programmes of study, attainment targets and statutory assessment arrangements, as set out in section 12 of the consultation document?
Given the short timescale of the changes it is likely that the new curriculum will not be available to schools before the start of the school year in Autumn 2013 so many will continue to use their current curriculum and would not wish to change ahead of time.


However, it may be that giving schools this option would allow them to bring in some changes early and spread the huge number of changes over a slightly longer timescale.

Q 14 Do you have any other comments you would like to make about the proposals in this consultation?
I think that it would be better to implement the changes incrementally, as has happened in the past.  Bringing in the change all at once is a huge undertaking: in primary teachers will be changing ALL subjects in 7 year groups, and in secondary they will be changing subjects in 3 year groups (not forgetting the forthcoming changes to GCSEs and A-levels).
 

Monday, 11 March 2013

Update on Energy

In my ongoing love-hate relationship with the concept of energy, I returned to the subject during a CPD session I ran today.

The session was for Primary teachers who have little, or no, science background.  The aim of the whole course (of which the session is but a small part) is to enable the teachers to develop a confident understanding of science up to KS3 level.  They will then be better able to support their pupils, and colleagues with primary science.

I had run a similar session before, but having read Millar's latest paper on energy, I decided that I would change things around slightly this time.

The structure was:
Introduction - what is Energy?
Answer - we're not entirely sure, but we know that it's conserved and we can do some interesting sums with it.  (The subplot of this is that as science teachers we/they don't have to know all the answers - suggested they use a question wall where they can 'park' questions).

Part 1: Food labels
We started by looking at lots food labels to get a feel for the energy contained in different foods.  We talked about the sort of sums that we could do with that information and also made diet and healthy living links.  We starting looking at 2000 kcal for an adult, and how much food was required to make that up.  We also looked at the energy density of different food types - always a bit of a shock.

(If I'd had more time, I would have burnt some food at this point.)

Food as a fuel and the linked to other types of fuel and energy resources.
This was a helpful next step, and took the flow of the session from the personal to the wider world.  I used one of the ASE Upd8 activities to look at some of the issues relating to the type of fuel to use in cars.  We then progressed to ideas about renewable and non-renewable fuels, which led naturally into David MacKay's thesis that we need to use numbers, not adjectives, to talk about consumption and generation of electricity/energy.

Part 2: how much is a joule.
An Energy Ladder
I used an 'energy ladder' to start thinking about the relative sizes of different energy stores.  This led to a sobering discussion of how much exercise we have to do to balance out the energy we receive from food.  Our unit of comparison was that it required approximately 1J to lift an apple up by 1 metre.

Part 3: Energy stores and energy stories
I then introduced the idea of energy stores, using those stores defined by the IOP in their SPT materials.  Each of these stores can be justified because there is an interesting calculation that we can carry out related to each of them - though not at KS3, or even KS4 in some cases.  Using the 'orange liquid model' of energy we looked at the energy stories of some different objects, making sure that we  carefully chose our start and end point, and didn't worry about what happened before or after that.  We also discussed the usefulness and limitations of the model.

Plenary:Telling their own energy stories.
Using different toys/items the teachers told the energy stories - choosing the start and finish points and talking about which energy stores were emptying and which were filling, and how the energy shifted between the places.


Reflections: looking at the overall structure of the session I think that it works well as it provided a coherent overarching story to the progression of energy ideas.  We did it in a short space of time, but it could easily be done as a curriculum topic.  The progression of ideas followed nicely from upper KS2 to KS3, and would extend to KS4 and the introduction of sums to calculate energy (kinetic, gravitational potential, specific heat capacity) as well as supporting the big picture of Energy post-16.





Sunday, 24 February 2013

Measuring gravity

One of the privileges of working where I do, is that I get the chance to listen to talks/presentations by people who are influential in education.

A while back I was at such a talk, and the speaker was describing an outstanding A-level Physics lesson he had seen. During the lesson the students were split into groups, and each group was using a different method to calculate a value for acceleration due to gravity, g. At the end of the lesson, they discussed all their different values and the teacher helped them to think about the importance of accuracy, repeatability and 'fair testing' that the students had learnt about for many years. However, the need to compare their different values of 'g' meant that they really started to understand the importance of such experimental details, as well as beginning to think about error analysis.


That set me wondering. How many ways are there to measure g that could be done by your average A-level class?

So here are the ones that I have found
  1. Measuring the period of a pendulum
  2. g by freefall using a timer (apparatus can be purchased from most educational suppliers)
  3. g by freefall using lightgates
  4. g by freefall using tickertape and a tickertape timer (word doc)
  5. g ball drop (using a normal ball and timers, using g-ball)
  6. Jump up popper and tracker or audacity
  7. Dropping small masses and recording the sound of them hitting the floor. (I'm in the process of writing a method for this.)
  8. Atwoods machine (never actually seen this done)
  9. Galileo's ramp
There are more than I thought that there would be.  Some of these are variations on a theme, but some of them are quite different.  There's certainly a lot of scope to discuss the accuracy of the different methods, as I suspect that some will give wildly different values of g.
      
You could also use simulations as well, increasing the number of possible activities or investigations.  The following are all from PhET
Pendulum lab
Mass on a spring
Ramp: Forces and motion

Are there any methods not on here that you use? Do let me know.


Additional reading: Improving science in colleges, Ofsted 2012 (pdf)

Tuesday, 19 February 2013

Teaching Energy

I've been thinking about energy a lot recently.  In part it's because I've been working on a course for primary school teachers, so I've had to really think what we teach at KS3 and KS4, and why.

" One reason for the difficulty in deciding what to say about energy at school level is that the scientific idea of energy is very abstract.  It is, for example, impossible to say in simple language what energy is, or means.  Another problem is that the word ‘energy’ has entered everyday discourse, with a meaning that is related to, but very different from, the scientific one. " Millar, Energy Summit Paper, 2012

Current KS3 Energy.

At KS3, energy is mostly naming of parts:
  • types of energy;
  • fuel sources;
  • renewable and non-renewable sources.
Look on the TES website and there are numerous resources which involve kids naming resources, match energy types, say how energy is being transformed etc.

Why are we interested in energy?
In most sciences, the reason that we are interested in energy is to do calculations.  The purpose of energy is to do sums (or quantative calculations). 

e.g in Chemistry to work out which is the most favourable reaction, in biology as calories, in physics to calculate efficiencies. 

That doesn't mean that we have to introduce equations early on.  Most children will be familiar with the idea of fuels, either fossil fuels or food.  That can be a good place to start a discussion of energy and the idea of use and conservation of energy
The KS3 model that many people use at the minute doesn't allow us to focus on the importance calculations in energy. It suggests that there are different types of energy, that can be found in different places. Energy is used to explain things, to give mechanisms, but energy in itself doesn't make good explanations.

It isn't that you have to be hung up on the language (should it be transform, transfer etc) but what is the underlying model and how useful is it. And I think a good starting point is...

Energy is Energy is Energy.


Orange liquid! Or a quasi-material entity.
Institute of Physics model of energy as an 'orange liquid'.
The IOP model, developed by Lawrence, suggest that we limit how we think of energy to those situations where we can (or want to) do calculations - maybe not at KS4 but later. We think of energy as being stored and shifted.

kinetic, gravity, thermal, nuclear, chemical, vibration, elastic, electro-magnetic

e.g
  • lifting an object. Chemical store is emptied, and gravitational store is filled. (note that not interested in intermediate motion as it doesn't affect the final energy store)
  • rolling an object down a slope to the bottom.  Gravitational potential store is emptied and thermal stores (of slope, of pen) increased.
  • Boiling water in kettle. Chemical store (from coal/gas power station) is emptied. Thermal store of water increased, thermal store of air increased, thermal store of kettle increased. 
The last example shows how we can then go on to build Sankey diagrams to consider efficiency.

So for example, using a pull-back car.  
My starting situation is just after I have pulled back the car.  An elastic energy store has been filled. 

At the end of it's motion, the elastic energy store has been emptied.  But where has that energy gone?
Mostly, it's heated up things - the desk, the tyres, the surroundings.  Some thermal energy stores have been filled.

Advantages: 
  • emphasises the continuous nature of energy;
  • provides reasons for choosing stores (ot just naming for the sake of it);
  • visually appealing and can easily show sankey diagrams
  • Don't have to consider intermediate chains of energy changes (which may be different depending on the detail in which you want to consider the problem in);
  • allows a development of the concept through Key stages.
  • Doesn't use energy as an explanation for changes
Disadvantages 
There are two main areas - the disadvantages of the model as a physical representation, and the perceived practical disadvantages:
  • Energy is a substance that is passed from object to object.
  • How to treat sound and light (and electrical energy)
  • doesn't match current textbooks and concern that examiners may not credit this version of energy ideas 
The third one is less of an issue now that KS3 SATs have gone. KS4 examiners will generally ask questions involving calculations (KE, GPE and efficiency) or about wasted energy. Given what candidates write at GCSE, it is unlikely that there will be problems with terminology.

Possibly the biggest stumbling block is that of light and sound. In the 'orange liquid' model light and sound are not energy stores. Rather, they are ways in which energy is shifted from place to place, ways in which stores are emptied or filled. 

In addition to energy stores the model contains pathways through which energy is shifted. 
  • Heating by particles
  • Electrical working
  • Mechanical working
  • Heating by radiation (including EM and physically e.g. via sound)
Thus, light and sound are ways of shifting energy, rather than energy stores themselves.

Which is logically consistent, but not how students and teachers usually think of them.  However, putting aside quantum definitions of the energy of a photon, we can't store light or sound. They are both transient objects. We do however think about light in terms of rate of energy transfer (watts or joules/sec).

Part of the problem is that we tend to want to 'daisy chain' links of energy transfer, worrying about where the energy is at every point between the start and end.  So we'll conventionally talk about the "chemical energy in the battery being transferred/transformed to electrical energy in the wires, and then light energy from the bulb, and then ...."  But where should we stop?  Should we consider the light as it reaches our eyes, or the electrical impulses that are generated in the cells on the retina, or what about at the synapses? None or these are particularly useful. 

Far better to stick to things we can measure.  Why are we interested in the bulb?  Often because we want to know how much energy per second it uses - it's power, not where the energy has gone.

To summarise:
  • Energy is tricky to teach well.
  • There are different models that can be used, but they all have advantages and disadvantages.
  • Examples where we can do calculations are very useful - that is often why we're interested in energy after all.
  • If' you're going to do an 'energy circus' choose wisely.  Ask students to think about specific start points and end points, and don't worry about anything in between those points, or that happens afterwards.  

Useful reading material: 

Robin Millar's Towards a research-informed teaching sequence for Energy, including a suggested teaching sequence. I would strongly recommend that you read this paper - it very clearly sets out some of the issues, and describes a way forward.  
If I was designing my KS3/KS4 curriculum, I would use this paper - and work with my feeder primary schools to get them to use his ideas too!

IOP Supporting Physics Teaching materials Energy 11-14. Useful self-study materials which outline the 'orange liquid' model, as well as suggesting teaching activities and discussing possible issues.  

Energy Summit: Developing a framework for the teaching and learning of energy. Assorted papers.

R.Millar Teaching about energy

You could also discuss this further on TalkPhysics

Sunday, 10 February 2013

Have your say ... again.

So, it would appear that, to some extent, Mr Gove has listened to the myriad voices ranged against his EBC proposals.  Whilst we are still waiting for the dust to settle to see what actually has been lost and gained, there are two consultations that need to be done.

Consultation on Draft National Curriculum

Consultation on Secondary School Accountability

Just as I wrote when the consultation on the EBCs was announced "If teachers (and others actually involved in Education) don't respond to the consultation, then the DfE will have no evidence of the depth of feeling about the changes.  It's easy to send out disparaging tweets ... on twitter, but does take a bit of time to respond to the consultation.  If we care about education, we should be willing to put time in to making our views known."

I'm re-posting my suggestion for an activity that could be used in staff meetings to help groups of teachers respond to the consultations.

It would take about 1 hour to do for each consultation, but the time could be shortened if needed. 


Step 1: What does the consultation say? 
Split the participants into groups of (of between 4 and 8) and give each group a copy of the appropriate consultation document (printed onto single sided A4 paper) and a sheet of flip chart paper which had been split into 8 pieces.
Each member of the group is given sections of the consultation to read and then summarise on the flip chart pieces.  Each section had to be summarised on a separate piece of paper.

For the NC consultation I suggest the following sections are used:
  • Section 1 - Background
  • Section 6 - Aims of the National curriculum
  • Section 7 - Programme of Study and Attainment targets (a big section!)
  • Section 8 - ICT
  • Section 9 - Equalities
  • Section 10 - View of parents (or rather, should parents know what their children are learning at each stage of the NC)
  • Section 11 - Implementation
  • Section 12 - Phasing and disapplication
The other sections are mainly procedural - although section 2 is about the structure of the NC.

For the Accountability consultation more of the sections are relevant, but sections are generally shorter.  I suggest sections 2 - 13 will need to be read, but these can be shared out amongst the group so that everyone has an approximately equal amount of reading to do.

It should take about 15 minutes to read and summarise each participant section of the document.

Step 2: Putting it all together
Each member of the group uses their flipchart piece to summarise what they have read and learnt.  This will take about 20 minutes.  It would be helpful if the group didn’t discuss what they heard at this point.
 In this way the flipchart paper is rebuilt to provide an overview of the consultation as a whole. 

The group can now discuss the consultation, say what they thought, and suggest other possibilities, as well as share ideas between groups.  This could take quite a while depending on how vocal people are.

Step 3: Answering the questions
Helpfully, the Department for Education has provided a word document for responses (NC consultation, Accountability consultation).  Print these out onto A3 sheets of paper and put them around the room in numerical order.
The teachers can then wandered around, writing their answers and thoughts to the questions, discussing further with each other as they did so.  They don’t have to respond to every question – just those you’ve got an opinion about.

At the end of the session, collate the answers into the word document and email it to participants.  That way, when they answer the consultation they have got a starting point to work from.

This process can be adapted depending on how many people you have, or how much time you have. However, it is very important that teachers give their views on these proposals, and I hope that this simple activity will help you to do that by 16th April (NC) and 1st May (Accountability) .