You are using a pulley system to lift a hanging weight. You arrange the pulleys

Question

You are using a pulley system to lift a hanging weight. You arrange the pulleys as shown in the diagram below, and pull down on the end of the rope with a force of 40 N. As you pull, the end of the rope moves a distance of 0.1 m downward. On the diagram, drag the appropriate labels to indicate both the amount of work (in joules) that you do while pulling the rope, and the amount of work done by the pulley on the hanging weight. Assume that the pulley itself is massless, and that friction is negligable.

Explanation / Answer

amount of work u do while pulling the rope = 40 * 0.1

                                                                      = 4 J

amount of work done by pulley on hanging weight = (40 * 0.1)/2

                                                                                 = 2 J

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