(Original post by Callum123)
First full correct UNOFFICIAL mark scheme for AQA Physics Unit 2 Higher - 30th Jan 2012
i) Electrons transferred from pipe to beads causing beads to become negatively charged.
ii) 75cm^2 beads
iii) As the size increases the charge decreases.
b) Pipe is smaller and so less overall charge is transferred to the beads.
i) Fine particles have a larger surface area.
ii) Earth pipes.
iii) These variables will affect the overall results.
i) Nuclear fission is the separation of a heavier nucleus into lighter nuclei by 'firing' neutrons into the nucleus. This also releases more neutrons. Nuclear fusion is the fusing of lighter nuclei to form a heavier nucleus.
i) Uranium 235/238
a) Constant speed, accelerating, decelerating
i) Braking Distance
i) 5000N in the opposite direction (to the left) - Newton's third law.
ii) Measure force exerted on specific points of the dummy.
ii) Straight line up to (0.8, 2), then a curve to (2, 12)
iii) As heat increases the filament in the lamp becomes more resistant.
a) They realised the pudding must contain a positive charge.
i) Experiments didn't support the pudding model, and so it could not be correct.
ii) Not deflected, partially deflected, almost fully deflected by gold atoms.
c) Showed that the nuclear model was correct.
b) 9.6 kgm/s
iii) Force is equal to change in momentum (mass x velocity) over change in time. If change in time increases then overall force decreases.