You need to know about forces and energy:
a) When a force causes an object to move through a distance work is done.
This should include ideas of both energy changes andmomentum changes.
b) Work done, force and distance, are related by the equation:
W= F x d
c) Energy is transferred when work is done.
d) Work done against frictional forces.
e) Power is the work done or energy transferred in a given time.
P = E / t
f) Gravitational potential energy is the energy that an object has by virtue of its position in a gravitational field:
Ep = m x g x h
g) The kinetic energy of an object depends on its mass and its speed.
Ek = 1/2 x m x v x v
You also need to know about momentum:
a) Momentum is a property of moving objects. p = m x v
b) In a closed system the total momentum before an event is equal to the total momentum after the event. This is called conservation of momentum.