The effective friction coefficient is applied to the study of the oblique impact of a rigid sphere against a ductile solid.
此有效摩擦系数被应用于研究刚性球自由斜冲击延性靶问题。
The perturbation method is used to analyse the motion of the rigid sphere under the action of the nonlinear sliding friction.
用摄动法分析刚球在非线性滑动摩擦力作用下的运动规律。
Experiment with a helium balloon, a hot air balloon, or a rigid sphere filled with different gases. Discover what makes some balloons float and others sink.
进行实验的是氦气球——热气球，或者一个充了不同气体的刚性球体。探究是什么让气球飘起来，而让其他物体沉下去。
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