Momentum = mass x velocity
Symbol is p. Unit is kgms-1.
It is a vector quantity, the direction is that of the object's velocity.
Newton's laws of motion
Newton's 1st law of motion = an object's momentum will remain the same, unless acted on by a resultant force.
Newton's 2nd law of motion = the rate of change of momentum is proportional to the resultant force on it.
The force is proportional to the rate of change in momentum i.e Newton's 2nd law, therefore:
The impulse is the force x time for which the force acts.
Units are Ns.
Force- time graphs
The area under the line of a force-time graph = impulse of the force.
This is because it is the force x time.