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AP® Physics C: Mechanics

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Horizontal Circular Motion

APPHMC-3LKHLM

A ball on the end of a string is being swung in a horizontal circle or radius, $R$ with a constant speed, $S$.

Which of the following statements best describes the relationship between the velocity of the ball and the net force acting on the ball?

A

The net force acting on the ball is in the same direction as the velocity of the ball.

B

The net force acting on the ball is opposite in direction as the velocity of the ball.

C

The net force is equal to zero because the object is traveling at a constant speed.

D

The net force is always perpendicular to the velocity vector at all points and always points outward.

E

The net force is always perpendicular to the velocity vector and always points inward.