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# Physics AS HEEELLPPPPP!! watch

1. Hey does anyone else here do as physics OCR specification B syllabus? becuase i do it, and the exam is on friday, and the textbook is useless for revision, our teacher gave us NO notes and i dont understand half the stuff on quantum theory and phasors and stuff, and i just wondered if any of you knew of a good website to use to revise that kinda stuff. Its a bit of an emergancy, thanks alot u guys
2. I feel your pain. Our teacher last year quit a month before the exam. Luckily, head of physics is a chief examiner for the board and gave us a crash course (mainly for section C) when he realised how little we had done!

Section C

Super position: Youngs 2 slits
Quantum phenomenan: google the "ultra violet catastrophe"
Distance of remote object: fire pulses of coded radio waves at Uranus (the planet...yes apparently physics teachers have a sense of humour! lol) and listen for the pulse which is reflected
Measuring Acceleration: Trolley, smooth horizontal surface (table), attached to a light inextensible string, over a smooth pulley to a mass hanging off the table. Smooth surface = no friction, light inextensible string = no mass of string and no delay when release of mass to movement of trolley, smooth pulley = no friction.

That helped me salvage a C grade (we were heading for E's with the knowledge we had) and I'm retaking on friday to up that mark considerably I hope. I bought "Letts Revise AS Physics" revision guide at Waterstones to learn the section A and B stuff.

Hoped that helped...good luck
3. (Original post by Rixter182)
Section C

Measuring Acceleration: Trolley, smooth horizontal surface (table), attached to a light inextensible string, over a smooth pulley to a mass hanging off the table. Smooth surface = no friction, light inextensible string = no mass of string and no delay when release of mass to movement of trolley, smooth pulley = no friction.
Hey,
Could you elaborate on this please? Would this then be a simple F=ma type thing? (ie, mg of mass = (mass of trolley + mass of mass)*a) ? And if so, does that count as actually MEASURING acceleration?
Or, am I just being unbelievably thick and is it more complex than that?!
Thanks

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