AP Physics 1 Question 339: Answer and Explanation

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Question: 339

7. In the figure above, two blocks of mass 3m and 2m are attached together. The plane is frictionless and the pulley is frictionless and massless. The inclined portion of the plane creates an angle θ with the horizontal floor. What is the acceleration of the block 2m if both blocks are released from rest (gravity = g)?

  • A. 2mg
  • B. g sin θ
  • C. g sin θ
  • D. g sin θ

Correct Answer: B



Because all the masses are attached and moving as a single unit, the acceleration of any block in the system is the same as that of any other. The net force on the blocks is Fnet = (2M)g sin θ. Therefore,