AQA GCSE PHYSICS UNIT 2 PHY2H January 2012 Unofficial mark scheme

so you think ill get 38, lowest 34 and if i get 34 you'll think ill get an A8 if not definately a A?

I think it's Uranium -235 that fissile, not -238.

You are correct. uranium 238 is unfissionable, when we enritch uranium we have a 2-3% pure lump of uranium 235 the rest is uranium 238 but is not used up. The correct answer will be uranium 235 and nothing else will be accepted not even just uranium

I think I got 43/44 out of 45 on this paper after going through it with my teacher.

I got the question about the cricket ball's velocity (4.8) wrong and thats pretty much all.

Is that a 100 UMS marks? I really want 100... sorry if I seem like I am bragging, just worried.

The problem is that I'm sure the average score on here would be higher than the average score in the country, the best way to do it would be to compare the difficulty to the other January exams and modify the boundaries. What do you think? I'll post my thoughts soon

I think I got 29, how many UMS do you think that is and what grade?

thanks

Saviour

1a) Friction between the pipe and the beads causes electrons to be transferred from the pipe to the beads (3)
ii) Volume of beads (1) Other correct variable as well
iii) As size increases, charge decreases (1)
b) All of the charges decrease as the pipe is shorter so there is less friction (2)
c) Fine particles- smaller particles have a higher charge due to surface area (1)
ii) Earth the pipes/ make pipes from antistatic material / shorten the pipes (1)
iii) Temperature, pressure and other variables might affect the MEI value/ results (1)
2a) Nuclear fusion is the joining together of small nuclei to form large nuclei whilst nuclear fission is the splitting up of large nuclei to form small nuclei. Nuclear fusion needs extreme temperatures to take place whilst fission doesn’t. (2)
ii) energy/ heat (1)
b) i) Uranium -235 (1) or just Uranium
ii) Same number of protons (1)
3a) Constant speed, accelerating, decelerating (3)
b)The distance travelled whilst the car is breaking (1)
ii) Speed (1)
c) 5000N on the car (to the left in the diagram) (1)
ii) To measure the force exerted on the dummy (1)
iii) 4 m/s^2 (3)
4 a) 2V (2)
ii) Straight line from origin to (2,0.8) Curved line from (2,0.8) to (12,2) (2)
iii) The filament lamp becomes hotter, (voltage increases faster than the current????) (1)
b) 108 J (2)
5 a) Pudding was positive with an equal but opposite charge to the electrons (1)
b) Experiments didn’t support pudding model but supported nuclear model (1)
ii) Most of the atom is empty space so many particles travelled through without being deflected (1) Nucleus is small and has positive charge so deflects reasonably nearby alpha particles slightly (1) Nucleus has a large mass and strong positive charge so deflects nearby alpha particles by large angles (1)
c) Results provided evidence for Rutherford’s theories suggesting his theories are right (1)
6a) 98 J (2)
b) 9.6 kgm/s (2)
ii) 9600N (1)
iii) Increases time catching the ball, decreasing the rate of change of momentum, reducing the force on the fielder’s hand. (2)