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有关静摩擦问题,我们可应用0≤f≤μ_sN……………………………………………………………(1) 求解.其中f是静摩擦力,μ_s为最大静摩擦系数,N为正压力.但用(1)式求解,一个突出的困难就是从一开始就要解不等式.虽然也可用图解法——摩擦角来处理某些问题,但由于较繁,所以用得不多.一般地,我们总是应用静摩擦定律f_(max)=μ_sN……………………………………………………………(2) 求解.当N为常量时,(2)式恒成立;但当N随主动力系的变化而变化时,静摩擦力f
Regarding the static friction problem, we can apply 0 ≤ f ≤ μ _ sN ........................................................................ (1) Solve. where f is the static friction force and μ_s is the maximum static friction. The coefficient, N, is a positive pressure. However, one outstanding difficulty in solving by formula (1) is to solve the inequality from the beginning. Although it is also possible to deal with some problems with the graphic method—the friction angle, but because of the complexity, There is not much. In general, we always apply the static friction law f_(max)=μ_sN..................................................................... (2) to solve. When N is When the constant is constant, (2) holds; but when N changes with the change of the main power system, the static friction force f