You wrap a rope around a pole, or around a rod, and you use the friction between the rope and that rod to your advantage, and it works as follows.
把一段绳子绕在柱上,或绕在棒子上,可以利用绳子,和柱子间的摩擦力,达到我们想要的,它是如此运作的。
I wrap this rope around here several times, and here I hang an object m which is substantially less in mass, m which is m, little m, mg and the tension equals mg.
我把绳子绕上几圈,这里挂一个物体,它的重量远小于,它的重量是,张力等于。
We wrap the rope around three times.
把绳子绕三圈。
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