Question

You and a friend are throwing a ball back and forth to each other What must be true about the ball in order for its momentum to change A all forces on it must have equal strength B all forces on it must be in the same direction C no forces at all must be acting on D an unbalanced force must be acting on it

Answer 1

For the momentum of the ball to change, an unbalanced force must be acting on it. Therefore, the correct answer is:

D) an unbalanced force must be acting on it.

Momentum changes when there is a net force acting on an object, which results in a change in velocity (either in speed or direction) according to Newton's second law of motion.