圆柱沿斜面作纯滚动时摩擦力作功的讨论

Discussion about the Friction Force does Work When the Cylinder does Pure Roll along an Oblique Plane

本文证明了圆柱沿斜面作纯滚动时摩擦力所作的正负功正好抵总效果是不作功，因此系统的机械能守恒。

This article has Proved when the cylinder does pure roll along an obligue plane the positive and the negative work done by the friction force just offset each other, so the total effect is that the friction force does not do any work Therefore,the systematical mechanical energy is conservativo