机械能守恒定律能很方便的解决连体问题,对多个物体组成的连体系统,要注意物体运动过程中系统机械能是否守恒.这种问题中单个物体的机械能并不守恒,所以应用机械能守恒定律时,必须选几个物体组成的系统为研究对象,注意寻找连接体之间的物理关系,利用ΔEK=-ΔEP的形式列方程解决.一、连绳模型此类问题要分析清楚物体的运动过程,注意物体之间的速 The law of conservation of mechanical energy can easily solve the conjoined problem, the system of multiple systems composed of multiple objects to pay attention to whether the conservation of mechanical energy in the process of object motion. In this problem, the mechanical energy of a single object is not conserved, so the law of conservation of mechanical energy , We must select the system of several objects as the research object, pay attention to find the physical relationship between the connectors, the use of △ EK = -ΔEP column solution to the form of a, rope model such problems should be analyzed clearly the object’s movement process , Pay attention to the speed between the objects