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# AS physics unit 1 questions-urgent help needed!! watch

1. Hello, I just did the brutal question paper below and I got only 47/80. I have corrected some of my errors, but not all. I do not understand how some of the mark scheme answers are formed and I do not actually understand them.

QP:
MS:

The questions which I feel completely clueless on are 16aii, 4, 5 and 14. The questions are too hard for me and I need some explanations.

THANKS A LOT!!!!!!!!!!
2. I figured out question 5. The vertical component of R is the same but opposite to W so that W is cancelled out. But The horizontal component of R maes it accelerate down the surface. But I still need help on questions 6aii, 4 and 14 please, please, please.

Thanks a lot
3. well for q4 since R is perpendicular to the slope ( or inclined surface ) the component in that direction has to be zero... if you are not sure then work out Rcosθ when θ is 900
4. I understand question 4

Here's my working out:
cos90=Component/W
cos90 X W=component

cos 90=0

hence component=0
5. If you just tilt your head a bit, or the paper, it still makes sense!
6. 4 and 5 make sense now

Just 14 and 16aii are killing me
7. For question 14 when the deceleration occurs, surely a resultant force acts to the left hand side to decelerate the train. Look at the direction of travel. So wouldn't A be pushed into their seat and both B and C be pushed to the left??? The MS says the opposite pretty much and I really want to understand how to tackle this killer question.

Thanks

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