This paper studies the nonlinear motion law of a simple pendulum with damping factor.
本文研究具有阻尼因素的单摆非线性运动规律。
Methods: A brain concussion was produced in rats using a simple pendulum device model.
方法：应用自制单摆式闭合性机械打击装置建立脑震荡大鼠模型；
Do the tangential force, the mormal force, the resultant force and their directions during oscillation of a simple pendulum change?
那么单摆在振动过程中，切向力、法向力及合力的大小和方向是否在变化?。
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