AP Physics 1 Question 42: Answer and Explanation

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Question: 42

2. A stopper of mass M is tied to a string of length R and swings around horizontally in uniform circular motion with a velocity of v when acted on by a force of F.

What is the power developed by the force?

  • A. FR
  • B. Fv
  • C.

    (C) Mv2

  • D. 0

Correct Answer: D


D There is no work done on the stopper because the force applied is perpendicular to the direction of velocity and the kinetic energy does not change. Therefore, there is no power developed.