靠重力作用的
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这就是著名的靠,摩擦力平衡的例子,现在我想讨论一个,可以在重力作用下,自由摆动的悬挂物体。
So you saw in a striking example of where friction helped us to balance, and now I want to discuss an object that is hanging and that can freely swing due to gravity.
youdao
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