一、问题提出将一物体迭放到(或滑上去)另一物体的表面上,如果两物体的接触面是粗糙的,两物体间可能就会产生摩擦力的作用。两物体间摩擦力的有无与两物体的运动状态密切相关,而摩擦力的有无及大小的变化又会反过来对物体的运动状态产生重要的影响。物体的运动状态与摩擦力之间的这种制约关系,在一定条件下就会造成迭放到一起的两物体问有时存在相对运动,而有时又不存在相对运动。 First, the problem is proposed to superpose (or slide) an object onto the surface of another object. If the contact surface of the two objects is rough, friction between the two objects may occur. The presence or absence of friction between two objects is closely related to the motion of the two objects, and the presence and size of the friction will in turn have an important influence on the motion of the object. The restricted relationship between the movement state of the object and the frictional force, under certain conditions, will cause the two objects stacked together to ask sometimes for relative movement, and sometimes there is no relative movement.