发布时间:2025-01-21 06:31:12
定滑轮的动力臂和阻力臂都是滑轮的半径,其实质上是一个等臂杠杆.根据杠杆平衡条件:F 1 L 1 =F 2 L 2 可知由于L 1 =L 2 所以F 1 =F 2 使用定滑轮既不省力也不省距离,但可改变力的方向.动滑轮的动力臂是滑轮的直径,阻力臂是滑轮的半径,其实质上是一个省力杠杆.根据杠杆平衡条件:F 1 L 1 =F 2 L 2 可知由于L 1 =2L 2 所以F 1 =
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知识学校电热水器安装示意图 主要有四个步骤 但是80的人不会安装
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