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摩擦力是指当一个物体在另一个物体表面上作相对运动或具有相对运动趋势时,在接触面上产生的阻碍物体间相对运动的力;因此摩擦力的方向,总是跟物体的运动方向或相对运动趋势的方向相反;它的大小,跟两物体间的接触面的粗糙程度和压力大小有关.初中阶段关于摩擦力的分析虽然较为简单,但由于摩擦力的题材可涉及到宏观世界的
Friction refers to the force that hinders the relative movement between objects when an object moves relative to another object or has relative movement on the surface of another object; therefore, the direction of friction always follows the direction of movement of an object. The relative movement trend is in the opposite direction; its size is related to the roughness of the contact surface between the two objects and the magnitude of the pressure. Although the analysis of the friction force in the junior middle school phase is relatively simple, the subject matter of friction can be related to the macroscopic world.