# A2 Physics

• ## Mock

• ### Classwork

• We did the main paper of the unit 4 mock.
• ### Homework

• Complete multiple choice paper & hand in ASAP.
• ### Plan for after Easter holidays

• Thurs 24/4: do an EMPA practice
• Weds 30/4: do an EMPA practice
• Thurs 1/5: feedback on those two EMPA tasks
• Fri 2/5 and Mon 5/5: real EMPA Part A
• Weds 7/5 and Thurs 8/5: practice for Part B
• Fri 9/5: real EMPA Part B
• ## Revision

• ### Classwork

• We did a revision quiz which was won by T.T.S closely followed by A.M.
• ### Homework

• Revise for mock. Past paper answers are here.
• ## Back emf

• ### Classwork

• Back emf in motors an transformers. Syllabus now finished.
• ### Homework

• Revise for mock next Thursday.
• ## Transformers

• ### Classwork

• We looked at transformers and started to clear up gaps in work.
• ### Homework

• Ensure you have completed Q.2-4 on P.126 and Q.1-4 on P.132.
• Answer Q.1 on P.133 and bring to next lesson.
• ## Moving coils in magnetic fields

• ### Classwork

• We applied ε = Blv and ε = -N ΔΦ/Δt to coils moving and rotating in magnetic fields.
• ### Homework

• Read and make notes on Example 2 on P.125 of AQA. It would be worth reading through that whole of Chapter 8.2 again and adding to the notes we made in class.
• Answer Q.2-4 on P.126. Check your answers in the back of the book. Hand in tomorrow morning.
• In class we worked out the peak emf of a spinning coil - to see the graph of emf over time have a quick look at P.127 of AQA.
• ## Induced emf

• ### Classwork

• We looked in more depth at the force between two current carrying wires, and tried to show that when a current is induced in a coil by a moving magnet, the magnetic field produced by the current opposes the motion of the magnet.
• We also looked briefly at the idea of flux and derived an expression for the emf induced in a wire moving perpendicularly to a uniform magnetic field.
• ### Homework

• Watch this video about flux. You can skip the boring bits, and also you can stop when he starts talking about Faraday's law.
• Read P.123-5 of AQA and check you are happy with the derivation of ε = Blv.
• ## Generating electricity

• ### Classwork

• We marked the past paper questions, and compared sunchrotrons with cyclotrons.
• We induced current in coils using a magnet and looked at Lenz's law.
• ### Homework

• I forgot to mention Fleming's right hand rule in the lesson (you have done this before anyway) - read P.120-122 and check you're happy with it. I'll demonstrate this next lesson.
• Watch this video about Lenz's law and use P.123 to add to your notes. IMPORTANT: in this video the guy uses a left hand grip rule - he does not mention it, but this works for ELECTRON CURRENT. We use either the right hand grip rule or the rule on P.123 for electromagnet current, because AQA always seems to deal with CONVENTIONAL CURRENT.
• ## Mass specrometer and cyclotron

• ### Classwork

• We looked in more detail at cyclotrons and mass spectrometers
• We watched the cloud chamber, although the magnetic field was not strong enough to see beautiful curved tracks like these:
• ### Homework

• Try electric field hockey
• Make sure you have finished Q.1-5 on P.116-8. Bring answers to next lesson.
• Make a table of similarities and differences between cyclotrons and synchrotrons. You might want to try the cyclotron applet on this page - I haven't found a decent synchrotron applet though.
• ## Mass specrometer

• ### Classwork

• We played the fields game
• We did these past paper questions and derived some expressions for parts of a mass spectrometer
• ### Homework

• Make detailed notes on the mass spectrometer and bring to next lesson. Include:
• how the ions are formed
• how the ions are accelerated
• how a particular velocity is selected
• how the ions are separated based on their mass to charge ratio
• how the ions are detected
• Use your textbooks and this video to help. Note that this video is far from perfect - be prepared to discuss the video next lesson in terms of what you found useful and if there is anything you would improve.
• ## Moving charges in electric and magnetic fields

• In class we did these past paper questions
• Read P.113-5 of the AQA textbook.
• Do some research about one of the following things. Be prepared to speak for 2 minutes about it in tomorrow's lesson. I mainly want to know about the motion of the charged particles and how it is achieved.
• cyclotron: CB, AG, CD
• mass spectrometer: LH, AP
• cathode ray tube: GdR, AM, TS
• Northern lights: EM, CC
• ## Moving charges in a magnetic field

• Read and make notes on P.110-112 of AQA and watch this video from 11:28 to 15:00 (when he starts talking about circular motion).
• The derivation in the video is a bit longwinded and you probably won't need to derive anything like that in the exam, but if you manage to follow it, it's nice to see how F=BIL and F=BQv are related.
• This video gives a quick explanation about the Hall effect - the diagram gets a bit messy, but hopefully it will help.
• Answer Q.1-2 on P.112 of AQA and hand in on Monday.
• ## Motor effect + electric motor

• Do last lesson's homework if you didn't do it.
• Write a review of a youTube video about the DC motor here. Have a look at other people's reviews and see if you agree. Make sure you put your name by your review / comments.
• Read and make notes on P.106-7, especially the formula F=BIL, then answer Q.1+2 on P.109. Bring these to the lesson tomorrow.
• ## Electromagnets and the motor effect

• Watch and if necessary make notes on this video about electromangnets, this video about electromagnet polarity, and this video about the motor effect. You have covered this before, although you would have used Fleming's left hand rule for the motor effect rather than your palm as this guy does.
• Can you think of any risks associated with the experiment in the first video?
• ## Revision

• Prepare for end of topic test tomorrow on chapters 4-6 (fields and capacitors).
• If you missed the lesson, the answers to the past paper questions in the book are here.
• ## Capacitors in timing circuits

• Please use the measurements made in class to determine the average force of the impact of the ball on the table.
• I need one report to be handed in by each group, which clearly shows the measurements you took, and how you used them to determine the force.
• In order to calculate the time of the impact you need to know the initial voltage, final voltage, resistance and capacitance.
• To calculate the force you need to know the mass of the ball and the velocity of the ball before and after the impact. You can work this out from the height it was dropped from and the height it rebounded to.
• Reminder: there is a test on fields and capacitance next Thurs.
• ## Past paper question practice

• Please complete Q.1-4 on P.102-3 of the AQA textbook and bring to tomorrow's lesson.
• N.B. there will be a test on Thursday 30th which will cover Chapters 4-6 (fields and capacitors).
• ## Charging a capacitor through a resistor

• Watch and make notes on this slightly boring animation about charging a capacitor though a resistor.
• Answer questions 2-4 on P.101 of the AQA textbook and hand in questions on Monday.
• ## Discharging a capacitor through a resistor

• If you missed the lesson we did these capacitor ratio questions in the lesson.
• Finish the past paper questions set in class. Bring to next lesson.
• Watch and make notes on this video about capacitor discharge.
• Attempt the questions at the end of the video, and bring the answers to next lesson.
• ## Energy stored in a capacitor

• Watch and make notes on this video on energy stored on a capacitor.
• Hand in questions on Monday.
• ## Introduction to capacitors

• Watch and make notes on this video which introduces capacitors.
• MAKE SURE YOU PAUSE AND WORK THE STUFF OUT AT THE END OF THE VIDEO.
• ## Electric field between parallel plates

• Watch and make notes on this video about the electric field between parallel plates.
• MAKE SURE YOU PAUSE AND WORK THE STUFF OUT DURING THE VIDEO - it will be good practice for you.
• Answer Q.1&2 on P.90 of the AQA taxtbook and hand in on Monday/Tuesday.
• Over the holidays, please answer the rest of the past paper questions on P.91-93 and bring to the lesson when we get back.
• This might sound like a lot of work, but it will be worth it.
• ## Electric potential and field strength

• IF YOU MISSED THE LESSON: we did these examlpes during the lesson.
• Watch and make notes on this video about electric field strength. NOTE: What he calls 'electric field intensity' we call 'electric field strength'.
• Watch and make notes on this video about electric potential and field strength.
• Do Q.1&2 on P.79 and Q.1&2 on P.82 of the AQA textbook. Hand in tomorrow morning.
• ## Coulomb's law

• Watch and make notes on this video about Coulomb's Law.
• Have a go at these examples.
• Read P.83-85 of the AQA textbook and answer the questions on P.85.
• Hand in on Monday (or whenever you can if you are away).
• If you fancy a bit of variety here's a nice video from someone else about field lines which I recommend you watch.
• AND I just found this video which is what would have happened today if we had a better power supply.
• ## Electricity basics

• Here are the past paper questions and the markscheme from last lesson.
• Watch and make notes on this video about electricity basics.
• Have a go at these examples.
• Read P.72-75 of the AQA textbook and answer Q1-3 on P.75.
• Bring to next lesson (Thurs).
• ## Past paper question practice

• Finish off past paper questions. Hand in on Monday.
• I will try to make a video about field strength inside a planet, but in the interim it is explained on P.62-63 of the AQA textbook.
• ## Field strength and potential

• Answer Q.1&2 on P.65 of the AQA textbook.
• Hand in the questions on Thursday morning.
• Watch and make notes on this video about field strength and potential.
• Have a go at these examples.
• ## Field strength

• Answer questions 1&2 on page 61 of the AQA textbook.
• Hand in the questions on Monday.
• Watch and make notes on this video about field strength.
• Have a go at these examples.
• ## Potential

• Watch and make notes on this video about potential in fields.
• Have a go at these examples.
• Do all this before the lesson on Thursday 21/11.
• ## Past paper question practice

• Finish and mark past paper questions; bring to next lesson.
• REVISE FOR TEST NEXT WEDNESDAY
• ## Intro to fields

• Watch and make notes on this video about mapping fields.