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

A gun of mass 2.0 kg fires a bullet of mass 1.6 x 10^-2 kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150 ms^-1, what is the recoil velocity of the gun? (JAMB 1984) 

A. 150 ms^-1 due West      B. 1.2 x 10^-4 ms^-1 due West      C. 1.2 ms^-1 due West      D. 1.2 ms^-1 due East

Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of the forces the masses experience. (JAMB)

A. 1:4    B. 2:1    C. 2:3    D. 2:5

A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000 m/s. What force does the gas exert on the rocket?

A. 500,000 N    B. 500 N    C. 50 N    D. 5,000 N

A cricket ball of mass 150 g has a momentum of 4.5 kg m/s. Determine the velocity of the ball in km/h.

A. 30 km/hr    B. 100 km/hr   C. 108 km/hr    D. 120 km/hr

A lead bullet of mass 0.05 kg is fired with a velocity of 200 ms^-1 into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is _______ (JAMB)

A. 50 J    B. 100 J    C. 150 J    D. 200 J