AP Physics 1 Question 407: Answer and Explanation

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Question: 407

5. A simple pendulum is constructed with a 3 kg mass attached to the ceiling with a 25 cm long string. What is the magnitude of the restoring force acting on the mass when the angle to the vertical is 30° ?

  • A. 1.5 N
  • B. 3 N
  • C. 6 N
  • D. 15 N

Correct Answer: D



The magnitude of the restoring force of a simple pendulum is given by the equation:

Frestoring = mgsinθ = 3 kg (10 m/s2)(sin30°) = 15 N