That should allow you to calculate the static friction coefficient and you'll get a chance to do that in your third assignment.
这样一来，请计算静摩擦系数，它将作为你们第三次作业的，一部分。
This is a way that you can measure the static friction coefficient.
这是测量静摩擦，系数的一种方法。
So the friction plays an essential role for us to get static equilibrium, and that is often the case.
摩擦力在达到静力，平衡中起了很大作用，情况就是这样。
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