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一、静摩擦力1.掌握静摩擦力有无的判断思路静摩擦力是当一个物体跟另一个物体间有相对运动趋势时产生的,而相对运动趋势的引起有两种情况,一是外力作用在物体上,二是物体的运动状态的改变.因此,在具体分析静摩擦力有无时一般有两种思路,一是从产生静摩擦力的原因即用相对运动的趋势来分析;二是从力的效果上即力与运动的关系来分析.
First, the static friction 1. Grasp the determination of the static friction is the idea of static friction is when an object with another object between the relative movement of the trend, and the relative movement of the trend caused by two cases, one is the external force on the object The second and the second are the changes in the state of motion of the objects. Therefore, there are two general approaches to the specific analysis of the presence or absence of static friction. One is to analyze the cause of static friction, that is, to use the tendency of relative motion; the other is the effect of force. The relationship between force and movement is analyzed.