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牛顿第三定律是指作用在两个物体的一对作用力方向相反、大小相等、作用在同一直线上、作用在不同的两个物体上。它具有以下性质:1力的作用是相互的。同时出现,同时消失。2相互作用力一定是相同性质的力。3作用力和反作用力作用在两个物体上,产生的作用不能相互抵消。4作用力也可以叫做反作用力,只是选择的参照物不同。5作用力和反作用力因为作用点不在同一个物体上,所以不能求合力。但是物理学的深入发展,暴露出牛顿第三定律并不是对一切相互作用都是适用的。实际上,只有对于沿着二物连线方向的作用(称为有心力),并可以不计这种作用传递时间(即可看做直接的超距作用)的场合中,牛顿第三定律才有效。
Newton’s third law refers to the role of the two objects in a pair of force in the opposite direction, the same size, acting on the same line, acting on two different objects. It has the following properties: 1 The role of force is mutual. At the same time, disappear at the same time. 2 The forces of interaction must be of the same nature. 3 force and reaction force acting on two objects, the role of production can not offset each other. 4 Force can also be called reaction force, but the choice of reference different. 5 force and reaction force because the role of the point is not the same object, it can not work together. However, the deepening development of physics reveals that Newton’s third law does not apply to all interactions. In fact, Newton’s third law is only valid for situations where there is a line of action along the two lines (known as effort) and where this effect can be dispensed with (ie, as a direct effect of distance) .