# AS Physics

• ## Circuits

• ### Classwork

• We went through some potential divider examples.
• I gave out some past papers for you to do.
• ### Homework

• Do lots of revision!
• Practise lots of questions.
• Remember you can come into school to see us if you need help.
• ## Revision & stuff

• ### Classwork

• We had a look at some past papers and did some parctice with uncertainty calculations.
• We tried to derive the result that R = r for maximum power transfer in a circuit but ran out of time.

• Revise.
• ## Practical Skills

• ### Classwork

• We did a simple experiment, plotted a graph and found the gradient and y intercept.
• We focussed on the marks usually available for results tables and graphs.

• ## Going through mock

• ### Classwork

• We did some Y9 Circuits Questions.
• We went through the mock.
• I gave you some tips on results tables for the EMPA - next lesson I'll give you some tips on graphs.
• ### Homework

• Continue to revise + prepare for the EMPA - make sure you have read through the EMPA booklet you were given last term.

• Unit 2 Mock Exam will be on this day - will run into lunch.
• ## Past Paper Questions

• ### Classwork

• We finished the past paper questions we started last lesson, and I gave out markschemes.
• ### Homework

• Revise for the mock next week. There are lots and lots of past paper questions here and the answers are here.
• ## Spectrometer

• ### Classwork

• We used a spectrometer to measure the wavelength of a sodium emission line.
• We started to do some past paper questions on waves.
• ### Homework

• Continue your revision for the mock next week.
• ## Diffraction Practical

• ### Classwork

• We went through the HW.
• We used lasers and various slits/gratings to take measurements and deduce the slit width / slit spacing / grating spacing / laser wavelength etc.
• ### Homework

• Hand in on Monday.
• ## Diffraction Gratings

• ### Classwork

• We sketched the diffraction patters from a single slit and a double slit.
• We saw the pattern produced by a diffraction grating, and found an expression for the maximum visible order.
• We deduced the wavelength of a helium-neon laser from measurements made with a diffraction grating, and got a surprisingly good result.
• We did Q2 and 4 on P207.
• ### Homework

• Hand in before reg on Thurs.
• ## No Lesson

• ### Classwork

• We didn't do much because hardly any people were here.
• ### Homework

• Watch this video about the diffraction grating formula and make notes, using P205-7 to help you.
• Watch this video which shows you the pattern produced by a laser passing through a diffraction grating. Notice how sharp the fringes are, and how widely spaced they are.
• Answer Q1 and Q3 on P207 and check your answers in the back of the book.
• Bring your work to next lesson.
• ## Two source interference

• ### Classwork

• We went through the notes you made on two source interference.
• We saw the fringe pattern produced by a double slit illuminated with a red laser, and what happened when one of the slits was covered. Here is a photo I took of the double slit demonstration last year: • We started to do some questions on P198 and went through Q1 - please check your answers to the others in the back of the book.
• We discussed the origin of the single slit interference pattern, but the explanation for it is not on the syllabus. We also started to discuss the shite light diffraction pattern - you can add to this with your HW.
• ### Homework

• Read P200-201 and add to your notes where recessary - we have covered most of this but you might want to add more.
• Answer Q1 and Q3 on P201.
• Read P202-204 and make notes, especisally on the formula for single slit diffraction fringes. The derivation is not on the syllabus.
• ## Refraction Problem

• ### Classwork

• We marked each other's homework using this markscheme.
• We did a difficult problem about refraction through a hollow triangular prism and then did the experiment to verify our predictions. They were pretty much spot on.
• ### Homework

• Watch this video and this video and make notes on P196-7.
• Don't worry about the derivation on P198 at this stage.
• ## Total internal reflection

• ### Classwork

• We went through the graph from last lesson.
• We did another refraction practical to investigate total internal reflection.
• We made notes on optical fibres and multipath dispersion.
• ### Homework

• Read P193-4 and add to your notes from the lesson - in particular about crossover of information between fibres, and endoscopes. You need to know about coherent bundles.
• Answer Q1 and 2 on P208. Leave out Q1 b ii). Bring your answers to next lesson.
• ## Refraction and TIR

• ### Classwork

• We calculated the path of a ray through a block - we can go through the water droplet next lesson.
• We derived the formula for the critical angle, and recapped on what refractive index is.
• We did a practical to investigate refraction.
• ### Homework

• Read P193-194 and answer Q1-3 on P195 and hand in on Monday morning when we get back.
• Have a good half term.
• ## Past Paper Questions

• ### Classwork

• We went through the homework and discussed Huygens' Wavelets - you can google this if you want to read more about it. It's good.
• Note: here's a video about Huygens' Principle which is very similar to what I said in the lesson. Except the guy sounds more excited about it than me...
• We did Q3-7 on P186-7.
• ### Homework

• Mark your classwork using the markscheme I gave out in the lesson.
• Read P188-9 and make notes if necessary - though you did just do this at the end of Y11.
• ## Wavefronts and rays

• ### Classwork

• We went through the HW (note answer in the back of the book is wrong).
• We plotted a graph of results from last lesson and found the speed of the waves on our strings.
• As expected, the greater the tension in the string, the higher the wave speed.
• We discussed the terminology of the 'fundamental' mode and the numbered 'overtones' and I demonstrated these with a guitar.
• Note I just remembered this video and this video about standing waves that might be useful for you.
• ### Homework

• Answer all the questions on P179 and hand in on Monday morning.
• ## Stationary Waves

• ### Classwork

• We watched some demonstrations on the ripple tank, including interference, reflection, diffration, and focusing by reflection.
• We made some notes on stationary waves - diagram from lesson is here.
• We started a stationary waves practical - more on this next lesson.
• ### Homework

• Read P182-3 and add to your notes where necessary - particulary the naming of the modes of vibration of a string (fundamental, first overtone, etc).
• This video might be useful (bit you need starts at 13:40).
• Answer Q1-2 on P183 and hand in on Thursday morning before registration.
• Have a go at this if you have the time.
• ## Phase difference and spuerposition

• ### Classwork

• We went through the test from last lesson.
• We went through the HW and played with sheets of polarisers.
• We made notes on phase difference and calculated some examples on this sheet.
• We saw a brief demonstration of superposition of sound waves - more on this next lesson.
• ### Homework

• Complete the superposition side of the sheet. Do it as accurately as you can. Bring to next lesson.
• This video and P180-181 should help.
• ## Test + Waves

• ### Classwork

• We did a short test on Chapter 11.
• We started the next topic - waves.
• We made some notes on wave basics - largely a recap of GCSE stuff.
• ### Homework

• Answer Q4 on P175 and Q1-3 on P177. Hand in on Thursday morning before registration.
• ## Chapter 11 recap

• ### Classwork

• We went through the HW, in particular the description of the Young's Modulus experiment.
• We did these past paper questions in the lesson.
• ### Homework

• Go through the answers to today's past paper questions here.
• Revise for a short test on Chapter 11 next Tuesday.
• Prospective engineers may be interested in this.
• ## Young's Modulus, stress-strain for steel

• ### Classwork

• We made some brief notes on key terms like strength, stiffness, brittle, ductile, plastic, elastic etc.
• We looked at Searle's apparatus for measuring Young's Modulus (see P168).
• We examined the stress-strain curve for steel in detail (see P168).
• Also I just found this video which is really good - it shows a real stress-strain curve using the method I described in the lesson. If we have time we can watch it next lesson.
• ### Homework

• Answer the past paper questions and hand in on Thursday morning before registration.
• ## Stress-strain curves

• ### Classwork

• We explored the concept of strain with a few examples, and introduced stress-strain curves.
• We collected data to produce a stress-strain curve for copper - I will print this off for you next lesson.
• We have still not really discussed Young's Modulus, but it's not too tricky and hopefully you've got the idea from the textbook and the video from last lesson. Will discuss next lesson.
• ### Homework

• Answer Q3-4 on P169 and Q1-2 on P171 and hand in on Monday morning.
• ## Stress

• ### Classwork

• I gave some feedback on graphs and calculations - a common error was to mistakenly give the energy in joules without converting cm to m.
• We made some notes on stress and measured the breaking stress of copper.
• ### Homework

• Read P167 and watch this video about stress, strain and Young's Modulus. Make notes on these.
• Answer Q1-2 on P169 and hand in on Thursday morning.
• ## Springs, combinations and energy

• ### Classwork

• We made some notes on springs, combinations of springs in series and parallel, and the work done extending a spring/elastic band.
• We saw the origin of the formula W.D. = ½FΔL and derived the formula W.D. = ½k(ΔL)² for springs where Hooke's law applies.
• These formulae only apply when the force and extension are directly proportional - otherwise you have to work out the area under the graph somehow.
• ### Homework

• If one person in each pair does one of the graphs, then I will photocopy them for you.
• Hand in on Monday morning.
• ## Springs

• ### Classwork

• I gave you some feedback on the recent test - please go through and complete your corrections.
• We did this experiment to determine the spring constant of a spring and combinations of springs in series and parallel.
• ### Homework

• Please plot a graph of your results that will enable you to calculate the spring constant. Plot all your graphs on the same axes.
• Complete the sheet and bring both to next lesson.
• ## Measuring Density & Calculating Uncertainty

• ### Classwork

• We measured the density of an aluminium cylinder and calculated the percentage undertainty in this measurement.
• We completed this sheet on uncertainty.
• ### Homework

• Try to correct your test papers, but don't worry too much about 1.a)i) and 6.c) as I will explain these next lesson.
• ## Test

• ### Classwork

• We did the test. You'll get your results next Tuesday.
• ### Homework

• Please do this anonymous survey before Monday.
• ## Renewable Energy

• ### Classwork

• We did AS-2008 Q7 here.
• We looked at renewable energy and estimated the maximum power output of a wind turbine, and discussed water turbines.
• Watch this video for a good description of Pelton turbines.
• We started to answer Q3 and Q7 on P160-161.
• ### Homework

• Revise for test on Chpapters 9-10 on Friday.
• ## Topic Recap

• ### Classwork

• We peer assessed each other's homework using this markscheme.
• We went through Q3 on P154 and Q3-4 on P156.
• We (very rapidly) estimated the average power output of a tidal barrage in the Severn estuary. More on this next lesson.
• ### Homework

• Revise for test on Chpapters 9-10 next Friday.
• ## Power and efficiency

• ### Classwork

• We investigated the efficiency of a motorized winch system - I took some more data at lunch time too so we can discuss this next lesson.
• We continued to answer the questions on P152, 154 and 156.
• ### Homework

• Answer Q4-6 on P161 and bring to the lesson on Friday.

• For those of you considering engineering or physical sciences at university you might want to have a go at some of these problems:
• i-want-to-study-engineering.org
• isaacphysics.org
• Physics Olympiad (try the GCSE and AS challenges)
• Also, since there are so many of you interested in engineering it might be a nice idea to do an engineering-based trip during the "bridge to A2" after your AS exams. If you have any ideas of somewhere we could go to visit for a day then let me know and I'll see what I can do...

• ## Work and pulleys

• ### Classwork

• We answered the questions on P150 - please catch up on this if you missed it.
• We considered the energy transfers in a pendulum (see also P152).
• ### Homework

• Do some reading and answer Q1-2 on P152, Q1-2 on P154, and Q1-2 on P156.
• Hand these in any time on Monday.
• ## Friction

• ### Classwork

• We went though parts of the homework and discussed the idea of 'g-force' and the equivalence of gravity and acceleration.
• We did an investigation into how the mass of a block resting on a table affects the friction bewteen the block and the table.
• ### Homework

• Make notes on work and energy - particularly how to calculate work done when the force and the displacement are in different directions, and the use of force-displacement graphs.
• Use P148-150 of the textbook and watch the first five minutes of this video (the second half is not so important).
• Actually this video might be better than the one I linked to above, since it covers graphs too.
• We will then do some questions on this next lesson.
• ## Car Safety

• ### Classwork

• We went through the HW.
• We built and tested crumple zones - if I get a minute I'll put the videos on YouTube and Yammer.
• As promised, here is the video.
• We started to analyse car crashes in terms of the impact time, and also looked at the impact distance.
• ### Homework

• Read and make notes on P143-145 and answer Q1-4 on P145. Hand in on Monday morning before registration.
• ## Toy Trains

• ### Classwork

• We did a long problem involving pulling toy trains.
• We held a coin that Isaac Newton himself may have held. It was amazing.
• ### Homework

• Imagine the kid from the worksheet rolls a train (mass 50g) down a slope with an angle of 10° and the train accelerates at 0.2ms-2. Draw a diagram and calculate the frictional force on the train.
• Read P140-142 and make notes (you have done lots of this at GCSE). Answer Q1-3 and hand in on Thursday morning with your answer to the train question too.
• ## Terminal Speed, Free Body Diagrams

• ### Classwork

• We watched your videos about terminal speed - I was v impressed and they all had really good aspects to them.
• We did Q1-2 on P139.
• ### Homework

• Read and make notes on P135-7.
• Watch this video which should help with pulley problems (see P137).
• Watch this video which should help with trailer problems (see P135). NOTE: this guy makes a mistake about Newton's Third Law (!!!) can you spot it and correct it?
• Answer Q1-3 on P137. Hand in on Monday morning before registration. Draw clear diagrams where necessary.
• ## Newton's Laws

• ### Classwork

• We did some basic calculations involving mass, weight and the formula W = mg.
• We went through a couple of questions from the test at the end of last half term.
• We introduced Newton's three laws, although we have not done any example problems yet.
• We drew some free body diagrams - more on this next lesson.
• ### Homework

• You need to know about terminal speed. You have done this before so I don't want to spend ages teaching it again.
• Brush up on terminal speed (see P138-9) and produce a short video (absolute max 5 minutes) and upload it to Yammer so we can watch it next lesson.
• You can work on your own or in groups. You can borrow the slow motion camera if you like.
• ## Test

• ### Classwork

• We did the test.
• ### Homework

• Go through your test and correct. I'll put the markscheme on here soon and maybe make a video about one of the questions. Here's the markscheme.
• ## Projectile Motion + Recap

• ### Classwork

• We did Q5-7 on P130-131.
• ### Homework

• Revise for test on Friday.
• Here are the markschemes for the past paper questions in the textbook for Chapter 7 and Chapter 8.
• ## Projectile Motion

• ### Classwork

• We worked though a few examples of projectile motion.
• We did a practical to find the speed of a ball rolling off a table.
• REMINDER FOR NEXT LESSON: discuss the practical in terms of random and systematic errors.
• ### Homework

• Answer Q1-3 on P127 and hand in on Tuesday morning before registration.
• For Q2 part c it is asking what the velocity is just as it hits the sea. You have to combine the horizontal velocity and the vertical velocity, remembering that these are both vectors.
• ## more suvat

• ### Classwork

• We went through an example of a two stage suvat problem (sand bag being dropped then coming to a stop when it hit floor)
• We did an experiment to time a ball rolling down a slope.
• ### Homework

• Finish the graph and deduce the acceleration. Bring to next lesson.
• Read P126-7 and watch this video which introduces projectile motion. Make notes on these.
• Watch this video (link starts at 50s - you can ignore the first bit) which is a great demonstration of the difference between the horizontal and vertical motion of a projectile.
• We will then use these ideas to solve projectile questions next lesson.
• ## suvat

• ### Classwork

• We discussed when the suvat equations can and can't be used.
• We did lots of examples of suvat problems (including Q1+3 on P121).
• We thought about getting numerical information from words in the question, e.g. 'an object accelerates from rest...' tells you that u=0.
• We demonstrated that objects fall at the same rate (assuming air resistance is negligible). For a more lengthy discussion see this video.
• ### Homework

• Q1-3 P125 - hand in Monday morning before registration.
• ## Curved graphs

• ### Classwork

• We went through the homework, and practised calculating the gradient and area under a curve.
• We also went off-piste a bit with some differentiation and integration that is not on the syllabus.
• FYI the function for the second graph was v = (t/10 - 8)3 + 512
• We started a practical on rolling marbles which we will continue next lesson.
• ### Homework

• The "suvat equations" are a set of 5 equations which help us solve problems about something that is moving with constant acceleration.
• s = displacement, u = initial velocity, v = final velocity, a = acceleration, and t = time.
• Watch (and optionally make notes on) this video which derives the suvat equations, using P116-8 of the textbook for help.
• You do not need to be able to derive the suvat equations, or even remember them (they are on the formula sheet) but it is not too difficult and it does help your understanding.
• Have a look at this example here which shows you how to solve problems using suvat equations. There are plenty more suvat examples on YouTube - e.g. here.
• Then try to answer Q1-2 on P118, and hand these in on Thursday morning before registration.
• ## Graphs of motion

• ### Classwork

• We went through the homework, then did some detailed recap work on graphs of distance, displacement, speed and velocity.
• ### Homework

• Answer Q2-4 on P130 and hand in on Monday before reg.
• ## Final moments

• ### Classwork

• We went through the homework questions on stability, looked at couples, and did a few past paper questions on moments.
• ### Homework

• Answer the following questions and hand in Thursday morning before registration:
• Q3-4 P110-111
• ## Two support problems

• ### Classwork

• We solved some more moments problems involving two support forces.
• ### Homework

• Read and make notes on P101-2. I will upload a video of this soon.
• Answer Q1-3 on P103 and hand in on Monday morning.
• Optionally join my slow motion video group and add some suggestions.
• ## Intro to moments

• ### Classwork

• We worked through an example of an object in equilibrium on a slope, and resolved the weight of the object into components parallel and perpendicular to the slope.
• We did a brief recap on moments (this was v quick since you covered a lot at GCSE).
• We did a practical to find the weight of an object and a metre ruler using moments.
• ### Homework

• Watch and make notes on this video about bridge support type problems.
• Answer Q1-2 on P100 and hand in tomorrow morning.
• ## Classwork

• We looked at more problems with three forces acting at a point, including Q.3-4 on P.96.
• We did an experiment where we deduced the weight of an object in equilibtium by resolving components of two other forces acting upon it.
• ### Homework

• Watch and make notes on this video about resolving forces parallel and perpendicular to a slope.
• Then watch this video which gives an application of this. There isn't a huge amount about this in the textbook unfortunately :(
• ## Resolving Vectors into Components

• ### Classwork

• We did a few examples of adding vectors, then looked at resolving vectors into components.
• We then used components to help us add together two vectors that were not perpendicular to each other.
• Finally we looked at situations where three forces acted on an object in equilibrium, and resolved into components to find an unknown force - more on this next lesson with a practical activity.
• ### Homework

• Answer P.93 Q.3-4 and P.96 Q.1. Hand in tomorrow morning.
• ### Textbook Reference

• P92 and P94-6 of AQA and P14 of AP4U
• ## Scalars and Vectors

• ### Classwork

• Quick overview of course, then we started looking at scalars and vectors (which you covered at GCSE).
• This video gives an excellent overview of scalars and vectors - it may seem a bit slow-moving but I recommend it highly.
• This video shows you how to add two non-parallel vectors - again it is quite slow but it is good. If you want to skip straight to the parallelogram method (which is on the AQA syllaubs) go here.
• This video shows you how to add two perpendicular vectors using Pythagoras' theorem.
• ### Homework

• You should all watch the first video on scalars and vectors, and add to your notes where necessary.
• If you want to make further notes on the parallelogram method or on basic use of Pythagoras and trigonometry, please use the videos above.
• ### Textbook Reference

• P90-93 of AQA and P10-11 of AP4U