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

A body of mass 100g moving with a velocity of 10.0 ms^-1 collides with a wall. If after the collision, it moves with a velocity of 2.0 ms^-1 in the opposite direction, calculate the change in momentum. (JAMB 1991)

A. 0.8 Ns       B. - 1.2 Ns      C. 1.2 Ns      D. 80.0 Ns

A 1000kg elevator is descending vertically with an acceleration of 1.0ms^-2.  If the acceleration due to gravity is 10.0 ms^-2, the tension in the suspending cable is ______ (JAMB 1986) 

A. 1.0 N       B. 10.0 N       C. 9000.0 N        D. 11 000.0 N

A force of 15 N acts on a body of mass 4 kg for 0.2 s. Determine the change in velocity.

A. 0.75 m/s   B. 75 m/s    C. 750 m/s    D. 7500 m/s

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

The moving head of a machine tool requires a force of 1.2 N to bring it to rest in 0.8 s from a cutting speed of 30 m/min. Find the mass of the moving head.

A. 192 kg     B. 1.92 kg      C. 19.2 kg      D. 192.0 kg