Why Students Lose Marks: AS Motion Questions
This Factsheet analyses students real answers to exam questions on motion in a straight line. By the end of this Factsheet, you should be more confident
Work Energy & Power
What happens if the object moves at right angles to the force,
or in the opposite direction?
If a force acts on a body and causes it to move, then the force is doing work.
If you are d
Vectors and Forces
Your average speed for the walk is:
total distancetotal time = 84 = 2ms-1
(since it takes 52 = 2.5s walking North and 3 2 = 1.5s walking South).
Vector quantities are commonly encountered in ph
40. (a) Consider an infinitesimal segment of the rod from x to x + dx. Its contribution to the potential at point P2 is
dV = Thus,
V = dVP =
1 ( x )dx 1 = 2 2 4 0 x + y 4 0
cx x + y2
cL x c 0 x 2 + y 2 dx = 4 0 4 0
L2 + y 2 y
= (8.99 109 N