为什么动滑轮的支点在边缘
为什么动滑轮的支点在边缘
其他人气:318 ℃时间:2019-12-16 22:47:17
优质解答
动滑轮是一种变形杠杆.当动滑轮转动时,支点在时刻变化.一直是绳与滑轮相切的那个点.所以说其支点在滑轮边缘.
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