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如何求摩擦力?这是令很多同学普遍感到较为棘手的一个问题。事实上,摩擦力的求解方法很多,除了可以用公式f=μF_N计算外,也可运用物体的平衡条件,牛顿第二定律、第三定
How to find friction? This is a problem that many students are generally more troubled by. In fact, there are many ways to solve the friction force. In addition to the formula f=μF_N, the balance condition of the object can also be used. Newton’s second law and third