A small ball can perform pure rolling,as well as rolling and sliding motion on a rough circular orbit.Using the theorem of center of mass motion and the theorem of angular momentum of the particle system,it is concluded that the motion of a small ball on a circular orbit is closely related to the dynamic friction coefficient.The motion of a small ball on a rough circular track is significantly different from that of a small slider on a rough circular track.The rotation of the small ball cannot be ignored and cannot be processed as a particle model.To avoid the influence of rotation,it is recommended to select the object as a small slider when setting the problem of controlling the movement of an object on a circular orbit in middle school.
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