A ball rolls on a smooth horizontal floor with constant speed

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A ball rolls on a smooth horizontal floor with constant speed. Two equal and opposite horizontal forces begin to act on the ball at the same moment. Which option describes the forces and the ball’s subsequent motion? (a) Forces are unbalanced; the ball accelerates in the direction of one of the forces.\text{Forces are unbalanced; the ball accelerates in the direction of one of the forces.} (b) Forces are balanced; the ball continues with the same speed in the same direction.\text{Forces are balanced; the ball continues with the same speed in the same direction.} (c) Forces are balanced; the ball gradually comes to rest.\text{Forces are balanced; the ball gradually comes to rest.} (d) Forces are balanced; the ball accelerates because two forces act on it.\text{Forces are balanced; the ball accelerates because two forces act on it.}

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