Physics Practice Tests – Newton’s Law of Motion

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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


An elevator of mass 4800 kg is supported by a cable which can safely withstand a maximum tension of 60,000 N. The maximum upward acceleration the elevator can have is _______ [g = 10 ms-2]. (JAMB 1987) 

A. 2.5 ms-2      B. 5.0 ms-2       C. 7.5 ms-2       D. 10.0 ms-2


A catapult used to hold a stone of mass 500 g is extended by 20 cm with an applied force F. If the stone leaves with a velocity of 40 ms-1, the value of F is _______

A. 4.0 x 104 N    B. 4.0 x 103 N    C. 2.0 x 103 N    D. 4.0 x 102 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


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