PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A ball rolls along a rough horizontal surface. A constant frictional force of 0.2 N acts opposite to the ball’s motion, and no other horizontal forces act on it. Which statement best describes the horizontal forces and the resulting motion of the ball?
(a) Forces are balanced; the ball continues at constant speed.
(b) Forces are unbalanced; the ball slows down.
(c) Forces are unbalanced; the ball accelerates in its original direction.
(d) The net horizontal force is zero; the ball gradually comes to rest.