Physics Practice Tests – Newton’s Law of Motion (Questions with Answers and Explanations)

Calculate the force needed to accelerate a boat of mass 20 tonnes uniformly from rest to a speed of 21.6 km/h in 1 0minutes.

A. 600 N   B. 100 N   C. 200 N   D. 50 N

When taking a penalty kick, a footballer applies a force of 30.0 N for a period of 0.05 s. If the mass of the ball is 0.075 kg, calculate the speed with which the ball moves off. (JAMB 1989) 

A. 4.50 ms^-1       B. 11.25 ms^-1       C. 20.0 ms^-1       D. 45.00 ms^-1

Determine the momentum of a railway wagon of mass 50 tonnes moving at a velocity of 72 km/h.

A. 10⁵ kg m/s      B. 10⁶ kg m/s      C. 10⁷ kg m/s      D. 10⁸ kg m/s