Reacting ( Secondary ) Forces: the evidence of the effects of inertia or momentum in the body as it reacts to the influence of the Initiating Force.
反作用（二级）力：当物体反抗原始力的影响时，惯性和动力的效果便是反作用力。
Reacting ( Secondary ) Forces: the evidence of the effects of inertia or momentum in the body as it reacts to the influence of the Initiating Force.
反作用（二级）力：当物体反抗原始力的影响时，惯性和动力的效果便是反作用力。
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