中学物理中经常研究两个物体间的相互作用问题,这些物体间的作用从表象看起来好像是不同作用的物体系,但是从本质上来说是恒力作用物体系和变力作用物体系,从能量的角度来说都是系统内机械能和其他形式的能的相互转化,或是系统内物体间机械能的转移问题,它们共同遵从动量守恒定律和能量守恒定律。一、恒力作用物体系在恒力作用物体系中,有部分机械能要转化为其他形式的 Middle school physics often studies the problem of the interaction between two objects. The role of these objects seems to appear to be different systems of matter, but in essence they are the system of constant force and the system of variable force. Energy point of view are the conversion of mechanical energy and other forms of energy within the system, or the transfer of mechanical energy between the objects in the system, they jointly comply with the law of conservation of momentum and the law of conservation of energy. First, the system of constant force In the system of constant force, some mechanical energy to be converted to other forms