AP Physics 1 Question 8: Answer and Explanation

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Question: 8


In the figure above, the coefficient of sliding friction between the small block and the tabletop is 0.2. If the pulley is frictionless and massless, what will be the acceleration of the blocks once they are released from rest?

  • A. 0.5g
  • B. 0.6g
  • C. 0.7g
  • D. 0.8g

Correct Answer: C


C The net force on the two-block system is 3mg - Ff, where Ff is the magnitude of the frictional force acting on the small block. Since Ff = μmg, we find that