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摩擦力是一种产生在两个物体接触面之间,阻碍物体相对运动或相对运动趋势的力。在物理学中将阻碍相对运动的力称为动摩擦力,将阻碍相对运动趋势的力称为静摩擦力。摩擦力产生的前提是两个物体间必须要有挤压,即物体间存在压力
Friction is a force that creates a tendency between opposing surfaces of two objects that impedes the relative movement or relative movement of the objects. In physics, the force that impedes relative motion is called dynamic friction, and the force that obstructs the tendency of relative motion is called static friction. The premise of friction is that there must be squeezing between the two objects, that is, there is pressure between the objects.