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动滑轮是什么杠杆
更新时间: 2021-06-09 00:56:30  

1、找支点.定滑轮支点是轴心,固定.动滑轮支点是动点,与线接触的地方.

2、动滑轮是省力杠杆,它是绕着固定的那一边的绳子动的,所以在最边(固定住绳子的一边)上的那个点是支点,而圆心就是阻力的作用点,手拉的一边就是动力.所以阻力臂是半径,动力臂是直径,动力臂是阻力臂的两倍.所以就是一个省力杠杆了.

关键词: 动滑轮 什么 杠杆

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