关于物体在滚动时摩擦力方向的判定

Judgment of the Friction's Direction in an Object Rolling

分析了在物体运动状态或所受外力已知的情况下,物体发生滚动时摩擦力方向的判定问题。

This article discussed how to judge the friction＇s direction of an rolling object, based on the state of the movement and the physical force act on the object.