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# AQA AS Physics A Unit 2 25/05/12 - PHYA2 Tweet

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1. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Any suggestions on waves? Do we need to know about waves in columns of air?
2. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by silentlife)
Any suggestions on waves? Do we need to know about waves in columns of air?
I've extensively gone through the Nelson Thornes As book and haven't seen the word 'column' written anywhere so I think, and hope, the answer to that is no.
3. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Any of you guys and girls been given any clues by your teachers as to what the practical task might be by any chance? I've started another thread on it but more people look at this one so was hoping to get some answers here instead. Cheers.
4. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Does anyone know how to derive the formula for energy stored=1/2F deltaL ??? please explain! x
5. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by JenniS)
Does anyone know how to derive the formula for energy stored=1/2F deltaL ??? please explain! x

Area under graph of force vs delta extension graph (area of triangle because gradient is constant (stiffness constant)) is the work done/energy needed to extend spring.

Hope that helps.
Last edited by silentlife; 04-05-2012 at 18:57. Reason: add quote
6. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by silentlife)
Area under graph of force vs delta extension graph (area of triangle because gradient is constant (stiffness constant)) is the work done/energy needed to extend spring.

Hope that helps.

ahh that makes sense, thanks. I knew it wasn't difficult, just couldn't remember how to derive it!
7. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by silentlife)
I've been searching around and there seem to be no discussion on this. So here goes...

Just to start off, here is the Jan 12 paper. Good luck everyone
Hi there. I was wondering if you had the mark scheme for this paper
8. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Ganep001)
Hi there. I was wondering if you had the mark scheme for this paper
I've got it, but I'm not allowed to post in on TSR as it is a breach of the rules. If you PM me with your e-mail, then I'll send it to you.
9. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Ganep001)
Hi there. I was wondering if you had the mark scheme for this paper

Last edited by louisjevans; 06-05-2012 at 16:53.
10. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Any suggestions on the next 2 dreaded 6-8 marker silly descriptions?
11. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Cheers mate
12. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by silentlife)
Any suggestions on the next 2 dreaded 6-8 marker silly descriptions?
the last 3 papers have been about waves so im guessing it'll be about youngs modulus
13. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Can someone please explain polarisation to me because I don't understand it, oh and stationary waves...what the **** are they?
14. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Hoping/praying for a nice paper
15. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Mystic Creature)
Can someone please explain polarisation to me because I don't understand it, oh and stationary waves...what the **** are they?
Damn I just wrote a load to you on this and then stupidly clicked off it...
16. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
how do you calculate the energy wasted?
17. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by cooldudeman)
how do you calculate the energy wasted?
Hmmmmm, probably just by working out the work done. What is the question?
18. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by aerf)
Damn I just wrote a load to you on this and then stupidly clicked off it...
Aahh them ones

I think I understand them.

Polarisation is all about whether the wave is travelling in one plane - if it is, then it is polarised, whereas if the vibrations change planes, the waves are unpolarised. And theres that polaroid experiment where unpolarised waves hit a polaroid filter, and only waves parallel to the way the atoms are arranged get through, and so the light gets polarised (right? please correct me if im wrong), and then when another polaroid filter, turned 90 degrees, is placed further down, no waves get through as they are all stopped by the atoms. Is that it? Anything else I need to know about?

And stationary waves, I finally understand what the **** they actually are! theyre just waves moving up and down on a rope..why couldnt my teacher have just bloody said so!! And I get the parts about nodes and antinodes and phase difference, so everything is looking that little bit easier, thank the Lord!
Last edited by Mystic Creature; 08-05-2012 at 20:42.
19. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Has anyone got suggestions for the six mark question in this paper?
20. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Can anyone explain the difference between progressive waves and stationary waves? Progressive waves make up a stationary wave, is it?
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