作用力和反作用力之间的关系 ,牛顿第三定律作了完整的概括和总结 :两个 (相互作用的 )物体间的作用力和反作用力总是大小相等 ,方向相反 ,作用在一条直线上 .学生在学完这些内容之后 ,在实际应用中却常常出错 ,尤其是很容易把作用力和反作用力与二力平衡相混淆 .那么如何正确 The relationship between force and reaction force, Newton’s third law made a complete summary and summaries: the force and reaction force between two (interacting) objects are always equal in magnitude and opposite in direction, acting in a straight line. After students have completed these contents, they often make mistakes in practical applications. In particular, it is easy to confuse the forces and reaction forces with the balance between the two forces. Then how to correct