As part a of the drawing shows, two blocks are connected by a rope that passes o

Question

As part a of the drawing shows, two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of m1 = 362 N, and the other has a weight of m2 = 958 N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? Correct: Your answer is correct. m/s2 (b) Suppose that the heavier block is removed, and a downward force of 958 N is provided by someone pulling on the rope, as part b of the drawing shows. Find the acceleration of the remaining block. Incorrect: Your answer is incorrect. m/s2

Explanation / Answer

a) net force = m2 g - m1g total mass = m1 + m2 a = (m2-m1)/(m2+m1) b) net force = m1g - F total mass = m1 a = g - F/m1 c) The answers are different because in the first one, the force of m2's weight contributes to move BOTH blocks. In the second, the hand pulls with the same force, but now only one block is moving.

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