A discussion is made of the work done by static frictional force and the conservation of mechanical energy in the work doing process by way of typical cases.
本文就静摩擦力做功以及在静摩擦力做功过程中机械能守恒问题，结合实例做进一步讨论。
And so that means that the frictional force is a maximum value possible, N which is the static friction coefficient times N, and therefore that is mu of s mgcos And when will that happen?
这意味着,摩擦力在最大值，静摩擦力因数乘以,等于mus乘以,θ，times，mg，times，the，cosine，of，theta。,什么时候会发生？
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