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问题已知人的重力为G.如果用绳直接将人吊起,所用的拉力F等于G.如果此人用如图1所示的定滑轮装置使自己升高,那么当不计绳重及摩擦时,人对绳的拉力等于G/2.
The problem is known as the person’s gravitational force. G. If the person is lifted directly with a rope, the pulling force F used is equal to G. If the person raises himself with the fixed sheave device as shown in Figure 1, then when the weight is not counted and the friction is People’s pull on the rope is equal to G/2.