在静摩擦中出现的摩擦力称为静摩擦力。当切向外力逐渐增大但两物体仍保持相对静止时，静摩擦力随着切向外力的增大而增大，但静摩擦力的增大只能到达某一最大值。当切向外力的大小大于这个最大值时，两物体将由相对静止进入相对滑动。静摩擦力的这个最大值称为“最大静摩擦力”。
用实验方法研究了颗粒物质与探测棒之间的最大静摩擦力。
The article reports experiments which show that the maximum static friction force F on the surface of an aluminum rod inserted in the dry granular.
而T又等于,因此m2g=m1gsinα,最大静摩擦力，也就是上面这个。
m2g Now, I know what T is, that is, m2 g + so m2 g equals m1 g sine alpha plus the maximum frictional force, which is this value.
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？
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?
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