Practice Question

1.When a force acts on an object, which can move, how will it affect the momentum of the object. 

The force will cause a change in momentum

2. State Newton’s 2nd law

Force = mass x acceleration

3. State the formula that links acceleration to velocity

Acceleration = change in velocity/time

4. State the equation that links Force to change in momentum and time taken

Force = (mass x change in velocity)/time

5.A 0.2 kg tennis ball moving at 15 m/s is caught in 0.05 s. What is the average force exerted?

Force = (mass x change in velocity)/time

Mass = 0.2 kg

Change in velocity = 15-0 = 15m/s. 0 came from the fact that the ball was caught, so when caught its velocity is 0 m/s.

time = 0.05 seconds

Force = (0.2 x 15)/0.05

Force = 60N