AQA PHYSICS A Level UNOFFICIAL MARK SCHEME - 15th June 2017

For the blue and red light refraction question, surely the refractive index in both substances will be greater or less as it said in the question the refractive index is higher/lower in any material, would that not mean the ratio of n1 to n2 would be the same and hence they would both go at 90 degrees as well

mass A had the two blocks on it? so woudnt have a larger mass? DX

"Compare the momentum of loaded trolley A as it moves downwards with the momentum of loaded trolley B"

Stupid wording. I assume they want you to say that the momentum would be the same, but wish they'd added the word downwards at the end to make it clear. It seems too easy to ask you to compare the momentums of each trolley when they're loaded and on the way down (i.e. on two consecutive trips), which means they're really testing your ability to read a badly worded question and not your physics knowledge.

"Compare the momentum of loaded trolley A as it moves downwards with the momentum of loaded trolley B"

Stupid wording. I assume they want you to say that the momentum would be the same, but wish they'd added the word downwards at the end to make it clear. It seems too easy to ask you to compare the momentums of each trolley when they're loaded and on the way down (i.e. on two consecutive trips), which means they're really testing your ability to read a badly worded question and not your physics knowledge.

for the momentum of the block i put that A would have a larger momentum than B since they are both moving with the same velocity and A has a larger mass?

For that one I wrote that B is doing work against gravity so smaller resultant force hence smaller momentum. Is this right as B is going Up

"Compare the momentum of loaded trolley A as it moves downwards with the momentum of loaded trolley B"

Stupid wording. I assume they want you to say that the momentum would be the same, but wish they'd added the word downwards at the end to make it clear. It seems too easy to ask you to compare the momentums of each trolley when they're loaded and on the way down (i.e. on two consecutive trips), which means they're really testing your ability to read a badly worded question and not your physics knowledge.

Im afraid not, altough the question was horribly worded.



I agree. It was worded in an awful way and for it to be 2 marks was confusing, since it didn't state what was happening to trolley B.

then whats the right answer

Well if they meant when LOADED trolley B goes down, then the momentum is the same since, LOADED A and LOADED B have same mass and they move with same speed in same direction, therefore they have the same velocity. So their momentum is the same.
If they meant a stationary LOADED trolley B, then the momentum is zero for B and momentum of LOADED Trolley A is (M+2M)* Change in V

Well if they meant when LOADED trolley B goes down, then the momentum is the same since, LOADED A and LOADED B have same mass and they move with same speed in same direction, therefore they have the same velocity. So their momentum is the same.
If they meant a stationary LOADED trolley B, then the momentum is zero for B and momentum of LOADED Trolley A is (M+2M)* Change in V

how can B be stationary if A is moving. they're both attached to the same pulley. so if A is moving then B has to be moving as well?

how about the ladder question. what did u write for that?

Well I messed up and didn't use moments. The correct answer was something like 120N.... somewhere between 100-150N i dont remember exactly. but you would use moments about G

When they are reloaded blocks onto it both are stationary. THIS IS WHAT IM SAYING THE QUESTION IS WORDED HORRIBLY xD

lol i dont get it we'll just have to wait tfor official mark scheme. lets move on. what do you think u got overall.

When they are reloaded blocks onto it both are stationary. THIS IS WHAT IM SAYING THE QUESTION IS WORDED HORRIBLY xD

Overall I feel like i got around 73-75%