1.相同点(1)大小相等;(2)方向相反;(3)作用在同一直线上. 2.不同点(1)力的作用点一对相互作用力:分别作用在两个不同的物体上.如绳吊灯,绳对灯的拉力与灯对绳的拉力是一对相互作用力,前者的作用点在灯上,而后者的作用点在绳上. 一对平衡力:作用在同一个物体上.如绳吊灯,绳对灯的拉力与地球 1. The same points (1) are equal in size; (2) are in the opposite direction; (3) act on the same line. 2. different points (1) the point of force of a pair of interaction forces: acting on two different objects, respectively On the ropes, such as a rope chandelier, the tension between the rope and the lamp is a pair of interacting forces. The former acts on the lamp while the latter acts on the rope. A pair of balancing forces: acting on the same On the object, such as a rope chandelier, the tension of the rope on the light and the earth