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# AQA GCSE Physics Unit 2 30th May 2012 Tweet

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1. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by umii2)
but i wrote that the KE decreases coz he jumped off so theres no more mass and the speed is stopping and so thats why KE decreases coz the formua is mass * speed. is that right??

and also the mass balance reading going up i wrote because electrons are transferred when people said its due to opposite charges...is that right
no thats not correct , because there IS mass of the skateboard ( 2.2kg) and the velocity you are told is 10m/s. so its going faster if anything.

for the mass balance, there is something to do with the rod gaining charge or something like that , but electrons wont transfer because the rod never touched the balance
2. (Original post by umii2)
iM guessing u guys also did c2 the 45 miniute one on the 24th may last thursday? can anyone be kind enough to put up an unofficial mark scheme of what answers they remember...I can only put up the ones I remember:

Q1 Sodium hydroxide
why dosnt it matter that the yeild of ammonia is low: coz h2 and n2 are recycled and another reason i didnt know
the mass question was 2.6 for the mass of N produced
why iron loses its electrical conductivity: it becomes iron oxide so loses the free electrons it uses to carry electrical charge-this was the last question
the experimental errors for the canister gas experiment: not weighing prperly i didnt know more

This is all i remember plz add more if u remember more answers
Thnx

http://www.thestudentroom.co.uk/show....php?t=2010897

This was posted from The Student Room's iPhone/iPad App
3. Unofficial mark scheme anyone?

This was posted from The Student Room's iPhone/iPad App
4. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by friedchicken)
Unofficial mark scheme anyone?

This was posted from The Student Room's iPhone/iPad App
first pages
5. Re: AQA GCSE Physics Unit 2 30th May 2012
hey guys for that question about directionally proportional, could you have said no, because it didnt increase by the same amount each time? thanks
6. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by EnviroProtector)
ohhh god right, well either way, it sounds alright! I dont know what UMS I need.... hmmm well I am predicted a B, but have got an A* in coursework and A* in the Chemistry unit 2 Jan exam this year, so i think I will defo get my B or higher, cross fingers :/ do you have any idea of what the total of all UMS points are to get an A or A* overall? what do you need?
you need 320 for an A and 360 for a A*, I think with your two A*s you could be in for an A* overall?
7. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Nikhil_m)
hey guys for that question about directionally proportional, could you have said no, because it didnt increase by the same amount each time? thanks
yeah that was kinda the perfect answer ahahaha
8. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Chlomc)
The question was worth 2 or 3 marks not 1. I know that 100%. It also gave about 4 lines to write so a one sentence answer about repelling isnt what they want. Besides it was the question before hand where they wanted answsers about repeling forces.

And i know for sure the question said at the start "a student noticed that as they moved the rod closer the weight increased on the reading" so therefore what you are saying makes no sense
no hes right, it asked what can you conclude from this( for the act the the weight increased as the rod moved closer)
you had to say, that the repulsion forces increase as you move them closer, thus pushing the rod down more, increasing the weight.
2 MARKS
9. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Fas)
yeah that was kinda the perfect answer ahahaha
i said no, because the points didnt all go thought the straight line?
10. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Fas)
yeah that was kinda the perfect answer ahahaha
ahh sweet I thought it was wrong because people were saying that it was yes because they both increase? how did u feel about the paper?
11. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Nikhil_m)
ahh sweet I thought it was wrong because people were saying that it was yes because they both increase? how did u feel about the paper?
no direct proportionality is if they both increase at the SAME RATE - they didnt increase at the same rate as each other.

I found the paper incredibly easy , and wouldnt be surprised if i got 45/45 A* will be like 36/45 i think
12. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by daniya12)
i said no, because the points didnt all go thought the straight line?
no sorry if you had said no because the line didnt go through the origin then it would have been correct ( but the line did go through the origin, so you couldnt have said that really lol )
13. Re: AQA GCSE Physics Unit 2 30th May 2012
the momentum question i had 2.29 and i rounded it to 2.3 will get 3 marks?????!!!!
14. Re: AQA GCSE Physics Unit 2 30th May 2012
I put for the graph one- no as the line wasnt straight through the origin?? and it had to be a straight line to be directly proportional i thought? ((((
15. Re: AQA GCSE Physics Unit 2 30th May 2012
I put for the graph one- no as the line wasnt straight through the origin?? and it had to be a straight line to be directly proportional i thought? ((((
did the line not pass through the origin? ive forgotton. if the line DIDNT pass through the origin and you said no because the line doesnt pass through the origin then you are correct
16. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by nevarsan)
the momentum question i had 2.29 and i rounded it to 2.3 will get 3 marks?????!!!!
how did you get 2.29? i got 2.2 , no need to round up or down , using the formula (mass x velocity of A) = ( mass x velocity of B ) which got 22=10x , then divide by 10 to get x = 2.2kg
Last edited by Fas; 02-06-2012 at 15:30.
17. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by daniya12)
no hes right, it asked what can you conclude from this( for the act the the weight increased as the rod moved closer)
you had to say, that the repulsion forces increase as you move them closer, thus pushing the rod down more, increasing the weight.
2 MARKS
Thankyou, I finished the paper in like 20 mins I checked it enough times. I don't understand some people talking about attraction forces??
18. Re: AQA GCSE Physics Unit 2 30th May 2012
yeah ^ you could have also said that this shows negative charges repel and the closer they get the bigger the force they repel each other at
19. Re: AQA GCSE Physics Unit 2 30th May 2012
Has anyone photocopied the Unit 2 Paper Higher and put it in an PDF, by anychance?
20. Re: AQA GCSE Physics Unit 2 30th May 2012
(Original post by Fas)
it was definitely parrallel
It was a series circuit. I know this because I was starring at that question for like 5 min lol. And a variable resistor would alter the current, not the PD. e.g.

12V= 12A x 1ohm
12V= 6A x 2ohms
12V= 3A x 4ohms
12V= 1A x 12ohms

As you can clearly see, increasing/decreasing the current and resistance levels has no effect on the PD. So, variable resistor doesn't increase/decrease PD levels.
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