When a force acts on an object that is moving, or able to move, there is a change in momentum:
The two equations can be combined to show how to calculate the force involved when a change in momentum happens:
force = mass × acceleration
Acceleration (a) appears in both equations, giving:
This is when:
The equation shows that the force involved is equal to the rate of change of momentum.
A 1,500 kg car accelerates from rest to a velocity of 30 m/s. This takes 20 seconds. Calculate the force acting on the car.