AP Physics 1 Question 246: Answer and Explanation

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Question: 246

1. A block attached to an ideal spring undergoes simple harmonic motion. The acceleration of the block has its maximum magnitude at the point where

  • A. the speed is the maximum
  • B. the speed is the minimum
  • C. the restoring force is the minimum
  • D. the kinetic energy is the maximum

Correct Answer: B

Explanation:

B

The acceleration of the block has its maximum magnitude at the points where its displacement from equilibrium has the maximum magnitude (since a = F/m = kx/m). At the endpoints of the oscillation region, the potential energy is maximized and the kinetic energy (and hence the speed) is zero.