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# The official AQA Physics Unit 2 thread (post exam) watch

1. Oh dear I got the acceleration to be 30 :/ I think I will be retaking in the summer I found the truck one hard as well. What did anyone get the percentage to be on the last page? X
2. (Original post by KerryE5)
Oh dear I got the acceleration to be 30 :/ I think I will be retaking in the summer I found the truck one hard as well. What did anyone get the percentage to be on the last page? X
I rushed that percentage one and got 0.242% which I think is wrong and probably is most likely.

As for the acceleration, dunno. Well if I got it wrong, I got it wrong can't do anything about it now.
3. That test was a peice of piss! I am sooo happy with it, found it about the same as last june's equivelent but i did a lot of silly mistakes on that. I have also done mechanics in maths since then and i was able to understand my math's teachers explanations of mechanics and understand them a hell of a lot easier than I understood it the first time around!

I'm really pleased, especially with the experiment explanation one as I was dreading that but it was an experiment i knew like the back of my hand

Only stuff that i'm really think i lost marks was potentially part of the truck question and parts of the crappy questions like explain the benifit to society, those are always dodgey

Btw for the question with the truck on the top of the second page of questions for it what did u guys get as the answer? I got 6000 and something and then divided it by 2 for each rear wheel to get 3000 and something as my answer, i think my way overcomplicated it, so i mighta made a mistake there
4. You don't count the first image, so it was 15ms.
5. 40% or something for the last Q?
6. (Original post by KerryE5)
Oh dear I got the acceleration to be 30 :/ I think I will be retaking in the summer I found the truck one hard as well. What did anyone get the percentage to be on the last page? X
i think i got 41.2? 41.8? deffinetely 40 something just took thier predicted value of power and diveded it by the value i calculated above and multiplied it by 100. Whilst the value above was Work Done not power it was the work done per second so the work done was equivelent to power in that case
7. (Original post by Tomdc)
i think i got 41.2? 41.8? deffinetely 40 something just took thier predicted value of power and diveded it by the value i calculated above and multiplied it by 100. Whilst the value above was Work Done not power it was the work done per second so the work done was equivelent to power in that case
I did the above and got like 41000% when I did that, so I stuck with dividing the other way round XD and got 0.242% xD Got that question wrong, for definite.
8. I thought this was quite a tricky exam, compared to the easy June 09 one anyway. Some of the questions were quite hard to understand (truck) but once you got your head round it, it wasn't actually that bad. That guitar question though was awful ¬_¬

I think I got: 3000 for the acceleration of the ball,
Rear springs took the greater load,
My percentage effciency was 0.242% as well (not sure if it's right though)

I did efficiency % = input/output x 100
I thought the input was the kinetic energy we just worked out, the output was the 10MW = work/time. In this case time was per second, t=1, so Work done =10MJ
Therefore efficiency was KE/10MJ x100 = 0.242% (pretty sure this is wrong though)

What did people get for the force the rear springs could take if the extension was 0.065m?
9. **** What acceleration?

I multiplied the J by 3 cause of 3 blades?
10. (Original post by cashfield777)
I thought this was quite a tricky exam, compared to the easy June 09 one anyway. Some of the questions were quite hard to understand (truck) but once you got your head round it, it wasn't actually that bad. That guitar question though was awful ¬_¬

I think I got: 3000 for the acceleration of the ball,
Rear springs took the greater load,
My percentage effciency was 0.242% as well (not sure if it's right though)

I did efficiency % = input/output x 100
I thought the input was the kinetic energy we just worked out, the output was the 10MW = work/time. In this case time was per second, t=1, so Work done =10MJ
Therefore efficiency was KE/10MJ x100 = 0.242% (pretty sure this is wrong though)

What did people get for the force the rear springs could take if the extension was 0.065m?
Same, rear spring of the load for me. 0.242% did exactly the same as you. 2250 for acceleration, though this as said may be wrong. I can't remember what value I got for the force though, although I did F = kL, where L = my value + 0.065.

Also it's the acceleration of the tennis ball in question 1.
11. I got 40% ish for effiency.

10MV out of 4x10 to the whatever times a hundred
12. (Original post by cashfield777)
I thought this was quite a tricky exam, compared to the easy June 09 one anyway. Some of the questions were quite hard to understand (truck) but once you got your head round it, it wasn't actually that bad. That guitar question though was awful ¬_¬

I think I got: 3000 for the acceleration of the ball,
Rear springs took the greater load,
My percentage effciency was 0.242% as well (not sure if it's right though)

I did efficiency % = input/output x 100
I thought the input was the kinetic energy we just worked out, the output was the 10MW = work/time. In this case time was per second, t=1, so Work done =10MJ
Therefore efficiency was KE/10MJ x100 = 0.242% (pretty sure this is wrong though)

What did people get for the force the rear springs could take if the extension was 0.065m?
Efficiency = output/input not input/output.

An efficiency of 0.242% would mean a wind turbine would barely produce any electricity.
13. (Original post by Playboy King)
Efficiency = output/input not input/output.

An efficiency of 0.242% would mean a wind turbine would barely produce any electricity.

.
.
.
Oops, thought it looked a bit wrong Ah well it was only 2 marks.
14. Reading this thread has made me realise of a few silly mistakes here and there, quite angry with myself now.
15. Has anyone got the actual paper, can you post it pls..
Same, rear spring of the load for me. 0.242% did exactly the same as you. 2250 for acceleration, though this as said may be wrong. I can't remember what value I got for the force though, although I did F = kL, where L = my value + 0.065.

Also it's the acceleration of the tennis ball in question 1.

Was the extension 0.065 or 0.065 PLUS the value from the question before? The question seemed a bit ambiguous 0.o

(And I got 39.2% efficiency I think, and 3000 for acceleration, did v=u+at I think. And 3920N for the force on each rear spring in the first question.)
17. (Original post by aurumpotestasest)
Was the extension 0.065 or 0.065 PLUS the value from the question before? The question seemed a bit ambiguous 0.o

(And I got 39.2% efficiency I think, and 3000 for acceleration, did v=u+at I think. And 3920N for the force on each rear spring in the first question.)
well from what I understood it was 0.065 + value from question before, because it said "additional 0.065m". Yeah I got 3920N for the force in each spring as well. I think I lost around 15 marks or so. But I'm hoping for a B minimum.

What did everyone get for the line of best fit, calculate young's modulus question?
18. (Original post by cashfield777)
I thought this was quite a tricky exam, compared to the easy June 09 one anyway. Some of the questions were quite hard to understand (truck) but once you got your head round it, it wasn't actually that bad. That guitar question though was awful ¬_¬

I think I got: 3000 for the acceleration of the ball,
Rear springs took the greater load,
My percentage effciency was 0.242% as well (not sure if it's right though)

I did efficiency % = input/output x 100
I thought the input was the kinetic energy we just worked out, the output was the 10MW = work/time. In this case time was per second, t=1, so Work done =10MJ
Therefore efficiency was KE/10MJ x100 = 0.242% (pretty sure this is wrong though)

What did people get for the force the rear springs could take if the extension was 0.065m?
6500N
19. I found this paper horrendously easy. I only spent 2 days revising for it and i think ive got (nearly) full marks. The acceleration was definately 3000ms^-2. The rear spring was 3920N on each spring. After the extension spring the weight at X could be max 6500N or summit. The guitar question made me lol, i was expecting one on overtures (12.6 in the book btw). I can't believe they put the same investigation question as they did in june, accept with a wire rather than an elastic band, and to calculate youngs modulus. The line of best fit wasn't sposed to be straight, cause otherise calculating the youngs modulus would be wrong. And as for the last question. It was just straightforward math, and playboy king is right, if it was only 0.21% efficient, it's probably not even worth the energy to make ^^.

Sorry if im sounding cocky, but iuno, it seemed alot more straigtforward than i thought it was gunna be.
20. Though i will say at this point actually, that i'm very good at mechanics in maths so it's not suprising i found this more straightforward than some poeple who either did a different module (eg. statistics) or don't do maths.

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