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摩擦有动摩擦和静摩擦之分.而摩擦力产生必须同时具备三个条件:(1)物体间互相接触、挤压;(2)物体间有相对运动和相对运动趋势;(3)接触面粗糙;这三个条件缺一不可.因此在判断摩擦力的有无、方向、大小及种类时.应首先对照产生摩擦力的条件或物体的平衡条件去考虑物体间有无摩擦,再考虑它的方向、大小、种类的问题.而这些概念都比较抽象,学生往往理解不透,概念模糊,形成误区.
Friction has the distinction between dynamic friction and static friction. The friction force must have three conditions at the same time: (1) the objects are in contact with each other and squeezed; (2) there is a relative movement and relative movement between the objects; (3) the contact surface is rough; These three conditions are indispensable. Therefore, when judging the presence or absence, direction, size, and type of friction, it is necessary to first consider whether or not there is friction between the objects, considering the conditions of the frictional force or the equilibrium conditions of the objects. Then consider its direction. Problems of size, variety, and kind. These concepts are relatively abstract. Students often understand the concepts, they are vague and misunderstanding.