AQA GCSE Physics Unit 2 30th May 2012
Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.
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Re: AQA GCSE Physics Unit 2 30th May 2012no 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.(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
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 -
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Here is the C2 thread(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
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Re: AQA GCSE Physics Unit 2 30th May 2012first pages(Original post by friedchicken)
Unofficial mark scheme anyone?
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Re: AQA GCSE Physics Unit 2 30th May 2012you 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?(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? -
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Re: AQA GCSE Physics Unit 2 30th May 2012yeah that was kinda the perfect answer ahahaha(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
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Re: AQA GCSE Physics Unit 2 30th May 2012no hes right, it asked what can you conclude from this( for the act the the weight increased as the rod moved closer)(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
you had to say, that the repulsion forces increase as you move them closer, thus pushing the rod down more, increasing the weight.
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Re: AQA GCSE Physics Unit 2 30th May 2012i said no, because the points didnt all go thought the straight line?(Original post by Fas)
yeah that was kinda the perfect answer ahahaha -
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Re: AQA GCSE Physics Unit 2 30th May 2012ahh sweet(Original post by Fas)
yeah that was kinda the perfect answer ahahaha I thought it was wrong because people were saying that it was yes because they both increase? how did u feel about the paper?
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Re: AQA GCSE Physics Unit 2 30th May 2012no direct proportionality is if they both increase at the SAME RATE - they didnt increase at the same rate as each other.(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?
I found the paper incredibly easy , and wouldnt be surprised if i got 45/45 A* will be like 36/45 i think
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Re: AQA GCSE Physics Unit 2 30th May 2012no sorry(Original post by daniya12)
i said no, because the points didnt all go thought the straight line? 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 )
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Re: AQA GCSE Physics Unit 2 30th May 2012did 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(Original post by madz2802)
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?((((
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Re: AQA GCSE Physics Unit 2 30th May 2012how did you get 2.29?(Original post by nevarsan)
the momentum question i had 2.29 and i rounded it to 2.3 will get 3 marks?????!!!!
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
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Re: AQA GCSE Physics Unit 2 30th May 2012Thankyou, I finished the paper in like 20 mins I checked it enough times. I don't understand some people talking about attraction forces??(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.
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Re: AQA GCSE Physics Unit 2 30th May 2012It 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.
...is that right
