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一圆柱体或圆球在平面上运动,要使其运动形式表现为纯滚动(无滑动的滚动),必须有足够大的摩擦力。这也就是说,摩擦力在滚动中起着重要的作用。可是此摩擦力究竟是属于静摩擦力还是滑动摩擦力,或者是滚动摩擦力,其大小及方向如何确定,在运动中起什么作用等问题,并不是人人都很清楚。本文将对上述问题逐个讨论。
A cylinder or sphere moves in a plane, and its movement form must be pure rolling (no sliding rolling) and must have sufficient friction. This means that friction plays an important role in rolling. However, it is not clear to everyone whether this friction is static friction or sliding friction or rolling friction. How the size and direction of the friction are determined and what role it plays in the movement. This article will discuss each of these issues one by one.