题目内容

按照图的要求画出滑轮组的绕绳方法(不计滑轮重、绳重及摩擦)

试题分析:动滑轮被几根绳子承担,拉力就是物体和动滑轮总重的几分之一(1)F=,由4段绳子承担滑轮的重;(2)F=,由5段绳子承担滑轮的重.

点评:滑轮组设计原则可归纳为:奇动偶定;一动配一定,偶数减一定,变向加一定.
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