A Monkey Climbing A Rope – What Happens?


A monkey hangs on one end of a rope which passes over a pulley and is balanced by a weight on the other end; the weight is the same as the weight of the monkey. The monkey decides to climb the rope. What happens next?



The weight goes up. The weight and the monkey counterbalance each other as long as the monkey remains stationary. But as soon as the monkey begins to climb, the additional energy it exerts to lift itself puts an extra pull on the rope which destroys the counterbalance, thus causing the weight to ascend.

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