In this article, non-central collision, superball and Newton′s cradle are analyzed with the virtual experiment which is a useful way of collision′s analyzing and teaching.
3
应用拉格朗日方程求解椭圆摆的周期,比用牛顿力学的方法简明方便。
It is more conciseness and convenience to solve the period of elliptical pendulum by using Lagrange equation than using Newtonian mechanics.