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@东岳 非常感谢东岳老师的答复。 我想要求的是阻力,但是目前来看输出的Fx和输出的drag大小完全相等,而且瞬时值有正有负,这个平板一直往x正方向移动,按理其受到的阻力应该是一直朝x负方向的一个力。我目前的理解是所得的Fx和drag均是平板运动过程所受的总的合力,但是如何分离其受到的阻力和摆动产生的推力,分别得到这两个力是我目前想要解决的问题。