# GCSE Physics - 11.5

• ## Last lesson!

• ### Classwork

• We had our last lesson.
• Well done for solving the puzzle.
• ### Homework

• Enjoy the summer.
• ## More Past Papers

• ### Classwork

• I gave out some Paper 2 papers and markschemes - these are not on the website.
• You should have January 2014 and June 2014. Some of the questions may have been used in your mock.
• You worked on these papers and I explained some stuff about the motor effect and the generator effect.

• ## More Past Papers

• ### Classwork

• I gave out this paper (with Q2 removed). Note: I should also have removed Q8 as this is not really on our syllabus either.

• ## Past Paper Practice

• ### Classwork

• I gave you feedback on common errors on the paper you did last lesson, and gave out the markscheme.
• We talked about proportionality and inverse proportionality and how to test whether two variables are proportional or inveresly proportional.
• ### Homework

• Do this paper (with Q4 taken out).
• If you would like me to mark it before next lesson, then you will have to hand it in on Friday morning - I won't have any time on Monday morning before our lesson.
• ## Past paper questions

• ### Classwork

• We started these past paper questions.
• ### Homework

• Finish the questions we started in class and hand them in before reg on Thursday.
• If you don't hand them in before this deadline then I won't be able to mark them for the lesson.
• ## Circuits Questions

• ### Classwork

• You did some questions on circuits on P174.
• ### Homework

• Do some revision.
• Have a good Easter.
• ## Eye vs Camera

• ### Classwork

• We made some notes on the similarities and differences between the eye and the camera. See also this video.
• We did these past paper questions about lenses.

• ## Lenses & the eye

• ### Classwork

• We made notes on the factors that affect the focal length of a lens.
• We made notes on laser eye surgery.
• ## The eye

• ### Classwork

• We looked at how the eye works, and I demonstrated long and short sight and their correction with a model eye.
• ### Homework

• Bring your marked work and any questions you have to next lesson.
• ## The lens formula

• ### Classwork

• We made notes on the lens formula and did several examples.
• We made notes on diverging lenses, did a few ray diagrams, and did a lens formula calculation for a diverging lens.
• We defined magnification.
• ### Homework

• Hand in tomorrow morning before registration.
• ## Lens ray diagrams

• ### Classwork

• We did ray diagrams and experiments for:
• u > 2f
• u = 2f
• 2f > u > f
• u < f
• ## Lenses and images

• ### Classwork

• We watched the video from the HW (as the link didn't work).
• We formed an image on a screen using a converging lens.
• We made notes on the features of images (magnified/diminished, upright/inverted, real/virtual).
• ### Homework

• Watch the first half of this video (up to when the object is at f) and make notes, using P110 to help you.
• Bring your notes to next lesson.
• ## Cover Lesson

• ### Classwork

• Read and make notes on P114-5. Answer the questions on P115.
• ### Homework

• Watch the first six minutes of this video about how lenses work and make notes on the key terms, using P108-9 to help you.
• Bring your notes to next lesson.

• THIS IS NOW POSTPONED UNTIL NEXT WEEK :(
• If you want to do it, practise some papers here.
• ## Lenses

• ### Classwork

• We went through the HW.
• We discussed optical fibres and fibre bundles.
• We did this task and then checked our result with a ray box and a semicircular block.
• We formed an image on a peice of paper with a magnifying glass - more on this next week.
• ## TIR Calculations

• ### Classwork

• We went throug the HW.
• We did Q3 on P105.
• I made a thin glass fibre which we saw light travelling through.
• ### Homework

• Answer Q5-6 on P106 and hand in by Thursday morning.
• ## Total internal reflection

• ### Classwork

• We did this starter activity about refraction.
• We did a practical activity to measure the refractive index of a perspex block.
• We made some notes on total internal reflection and the formula for the critical angle.
• We did a short practical to see total internal reflection in a semicircular block.
• ### Homework

• Hand in tomorrow morning.
• Watch this video about optical fibres.
• ## Snell's Law

• ### Classwork

• We used Snell's law to calculate unknown angles of incidence and refraction when light travels from air into a substance.
• We made brief notes on how to adapt Snell's law to answer questions when light moves from a substance into air.
• ## Refractive index

• ### Classwork

• We went through the HW.
• We defined refractive index and did a few simple calculations.
• We started to look at Snell's Law.
• ### Homework

• Answer Q1-2 on P103 and hand in before Thursday morning.
• ## Switch Mode Transformers

• ### Classwork

• We did some Qs on transformers (Q6-7 P208).
• We made some notes on switch mode transformers (see P205).
• We did some recap on reflection and refraction of light.
• ### Homework

• Answer Q1-3 on P99 and hand in tomorrow morning before reg.
• this video may help for Q2, although it does not really explain why this happens.
• ## Making a Transformer

• ### Classwork

• We did some practice questions on the transformer formulae.
• We assembled and tested a transformer.
• ## Transformer formulae

• ### Classwork

• We added to your notes on transformers, and looked at these transformer formulae:
• Vs/Vp = ns/np
• VpxIp = VsxIs
• ### Homework

• Note: I forgot to post this yesterday, so deadline is extended to Thursday morning before reg.
• ## AC generator, DC generator, dynamo

• ### Classwork

• We made notes on AC and DC generators, and how the voltage can be increased.
• We answered the questions on P203 and went through the ideal answers.
• We watched a dynamo in action, and made brief notes on how they work.
• ### Homework

• Read P204-5 of the textbook and watch this video.
• Make notes on these and bring to next lesson.
• ## The AC generator

• ### Classwork

• We did these questions on the generator effect.
• We started to examine the AC generator - more on this next lesson.
• ## Induced current in a coil

• ### Classwork

• We went through the honework, and filled in any gaps in your answers.
• We added to our notes on inducing current in a coil.
• ### Homework

• There is no need to make notes on these, but I want you to familiarize yourself with the ideas so that we can make good progress next lesson.
• ## Generator Effect

• ### Classwork

• We made some notes on the generator effect and watched a few demonstrations.
• You experimented with a magnet, a coil of wire, and a sensitive ammeter.
• We started to consider in detail the voltage induced in a coil by a moving magnet - more on this next lesson.
• ### Homework

• Answer Q1-2 on P201 and hand in tomorrow morning before registration.
• ## Electric Motor Assembly

• ### Classwork

• We assembled a DC motor - most people got theirs working well.
• ## The electric motor

• ### Classwork

• We went through the HW.
• We saw a demonstration of an electric motor, and watched an animation showing how it works.
• Next lesson you will assemble and test an electric motor.
• ### Homework

• I recommend you watch the video again, and read the bit on P199 about the electric motor.
• You only need to watch up to about 2 minutes - everything after that (when the extra coils get added) is optional but you may find it interesting.
• ## Motor Effect

• ### Classwork

• We made notes on the motor effect and Fleming's Left Hand Rule, and saw a demonstration.
• We did some questions on the motor effect.
• ### Homework

• Answer Q1 on P209 and hand in tomorrow morning before registration. Watch the video linked above if you need more help.
• ## Electromagnets

• ### Classwork

• We continued to make notes on electromagnets.
• We looked at a relay (see P197 and this video) and started to look at the electric bell.
• Note: I just found this video which explains the polarity of electromagnets if you missed the lesson.
• ## Past paper questions

• ### Classwork

• I gave out some more past paper questions - these are from specimen paper 1 here.
• The markscheme for specimen paper 1 is here.
• ### Homework

• Continue your revision for the mock - you can use any of the past papers on the AQA website.
• ## Specific heat capacity and latent heat

• ### Classwork

• We went through Q6 of last week's homework.
• We did some revision of specific heat capacity and latent heat and answered these questions and these questions.
• ### Homework

• Please do this anonymous survey before next lesson.
• Revise for your mock - remember it does not invlude Chapters 11 or 18.
• ## Homework Feedback

• ### Classwork

• We went through the homework on some detail.
• We got up to Q6 - hopefully you should be able to have a good go at that now if you found it hard first time round.

• ## Investigating Effifiency

• ### Classwork

• We did some recap questions on specific heat capacity (see P128-9 of the textbook).
• We measured the efficiency of a 12V incandescent bulb, and evaluated the result (it turned out to be an overestimate as we did not take into account heat lost to the beaker and surroundings).
• ### Homework

• Answer Q4,5,6 on P192 and hand in tomorrow morning before registration.
• ## Household Electricity - Recap

• ### Classwork

• We went through the homework and combined the formulae V=IR and P=IV.
• ## National Grid

• ### Classwork

• We looked at a demonstration of the national grid, and saw that less power was wasted in the higher voltage power lines.
• We did the questions on P191. Answers here.
• ### Homework

• Answer Q1 Q3 and Q4 on P193. Hand in any time tomorrow.
• ## Cost and Efficiency - Lighting

• ### Classwork

• We did some more calculations on cost of electricity, and made some notes on different types of light bulb (see P189).
• We comapred the cost of using different light bulbs over 20 years using this worksheet.
• ### Homework

• Watch and make notes on this video about the National Grid. Use P190-191 to help you.
• You need to know the approximate voltages of the different parts, and also appreciate why they bother to step the voltage up so high.
• Bring your notes to next lesson.
• ## Cost of electricity

• ### Classwork

• We calculated the cost of using different electrical appliances, and also the cost of leaving things like TVs on standby.
• ## RCCBs

• ### Classwork

• We went through earthing and looked at how RCCBs work.
• ### Homework

• Watch and make notes on this video about calculating the cost of electricity. See also P187 of the textbook.
• Look around your house and record the power rating of five different appliances (you will often find the power rating on a sticker on the back) - e.g. hoover, kettle, microwave, tv, radio, hairdryer, phone charger, ... Bring the list no next lesson so we can use it.
• ## Fuses and circuit breakers

• ### Classwork

• We made notes on fuses and circuit breakers, and watched a demonstration of fuse wire melting in different situations.
• If you missed the lesson watch this video.
• ### Homework

• We will go over this lesson and also look at RCCBs (which are mentioned on P181).
• ## Cables, plugs, fuses

• ### Classwork

• We went through the homework and looked at fuses and how to calculate which fuse to use using the formula P = IV.
• We also briefly discussed circuit breakers and how they work.
• ## Oscilloscopes, Mains and Rectification

• ### Classwork

• We did corrections for the oscilloscope homework.
• We looked at the voltage and frequency of mains electricity, and considered how a diode would affect current in a circuit with an AC power supply.
• ### Homework

• Watch this video about mains cables and plugs, and read P178-9 of the textbook.
• Make notes on both of these and bring your notes to next lesson.
• ## Using Oscilloscopes

• ### Classwork

• We used oscilloscopes to measure the period, frequency and amplitude of an AC voltage across several components in a series circuit.
• ### Homework

• Complete both sides of this worksheet and hand in tomorrow morning before registration.
• ## AC and Oscilloscopes

• ### Classwork

• We saw how an oscilloscope can be used to find the frequency and amplitude of an AC voltage. I gave out this guide.
• You will practise using oscilloscopes yourselves next week.
• ## Circuits Questions

• ### Classwork

• We pracrised some questions about circuits.
• ### Homework

• Please watch and make notes on this video about alternating current.
• The main bit I am interested in is at the start where he compares AC with DC, however it will be useful to watch the later stuff about oscilloscopes too since you will use them soon.
• ## Electricity Recap

• ### Classwork

• We defined voltage and current (which you have done before in Y9).
• We did some recap questions on P185 (we will go through Q3 next lesson). These involved the formulae:
• Q = I x t
• E = V x Q
• V = I x R
• We started to look at Alternating Current, but will do more on that later.
• ### Homework

• Recap on rules about voltage and current in series and parallel circuits by wathcing these videos. Make notes where necessary - you have covered all of this in Y9 but you may have forgotten some of it:
• We will then answer some questions using these ideas next lesson before moving on with AC and DC.
• ## Test Feedback

• ### Classwork

• We went through the test, then did some recap stuff on electrical circuits.
• ### Homework

• No homeowrk.
• ## Test

• ### Classwork

• We did the test. You'll get your marks next lesson.
• ### Homework

• No homework.
• ## Revision

• ### Classwork

• We experimented with hydraulic systems made from two syringes, and calculated how much they would multiply the input force by.
• We answered Q3-4 on P65.
• ### Homework

• Revise for test tomorrow.
• ## Past Paper Questions

• ### Classwork

• We started these past paper questions.
• The markscheme is here if you want to check before next lesson.

• ## Force Multipliers

• ### Classwork

• We went through the problem from the homework.
• We made detailed notes on ratio methods for solving force multiplier problems.
• ### Homework

• Revise for test next week.
• ## Hydraulic Systems

• ### Classwork

• We finished both sides of the sheet from last lesson and went through the answers.
• We used ratio methods for hydraulic systems and levers - we will make more detailed notes on these next lesson.
• We did this problem which combines hydraulics and levers.
• ### Homework

• Do the hard hydraulics question and hand in tomorrow morning before registration. REMEMBER TO HAND IN WHATEVER YOU HAVE DONE EVEN IF YOU HAVEN'T FOUND ALL THE ANSWERS.
• Homework clues:
• i) You can either use moments or use the ratio trick - the ratio of the forces is the opposite of the ratio of the distances from the pivot.
• ii) You know the force on piston P from part i). Use the hydraulics ratio trick to find the force at piston Q.
• iii) Use the formula work done = force x distance.
• iv) and v) You are on your own with these - do your best to figure it out.
• ## Hydraulics

• We went through the elephant problem from last lesson.
• We did some questions on pressure and hydraulics.
• We will go through the worksheet next lesson.
• ## Hydraulics

• ### Classwork

• We briefly went over the graphs completed for homework, and looked at the formula F = mv2/r (though this is not required for GCSE).
• We started to introduce hydraulic systems.
• ### Homework

• Watch and make notes on this video on hydraulic systems.
• Then finish off the example in our notes to work out the upward force on the piston with the baby elephant on.
• Optional: find out how much a baby elephant weighs.
• ## Moments & Circular Motion

• ### Classwork

• We finished off the worksheet on Moments and Stability.
• We did a practical to investigate the relationship between the speed and the centripetal force on a rubber bung moving in a circle.
• ### Homework

• Plot a graph with force on the x-axis and speed on the y-axis.
• Write a conclusion.
• Hand in TOMORROW MORNING before reg.
• Optional: plot a graph with speed2 on the x-axis and force on the y-axis. What does this tell you?