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在用滑轮组吊重物时,若动滑轮重和摩擦不计,动滑轮被n股绳子吊起,所用的动力F就是物重G的n分之一。即F=1nG,滑轮是一个变形的杠杆,在用轻质杠杆吊重物时,动力F与物重G也有这样的关系吗?1推导如图(1)所示,当杠杆平衡时,由杠杆平衡条件F1·l1=F2·l2得:F·l1=G·l2所以F=ll12G,设
When using a pulley group to lift heavy objects, if the weight and friction of the moving pulley are not counted, the moving pulley is hoisted by the n-strand rope, and the used power F is one-nth of the weight G of the material. That is, F=1nG. The pulley is a deformed lever. When using a lightweight lever to lift the weight, does the relationship between power F and the weight of the object G have the same relationship? 1 The deduction is shown in (1). When the lever is balanced, The lever balance condition F1·l1=F2·l2 is: F·l1=G·l2 so F=ll12G,