大学 物理 3.牛顿第三定律 "To every action there is always opposed an equal reaction,or,the mutual actions of two bodies upon each other always directed to contrary parts.” 对于每一个作用，总有一个相等的反 作用与之相反；或者说，两个物体对各自 对方的相互作用总是相等的，而且指向相 反的方向。 3.牛顿第三定律 “To every action there is always opposed an equal reaction, or, the mutual actions of two bodies upon each other always directed to contrary parts.” 对于每一个作用，总有一个相等的反 作用与之相反；或者说，两个物体对各自 对方的相互作用总是相等的，而且指向相 反的方向。 8 大学 物理