运用机械能守恒定律时应注意的问题湖北安陆市教研室杨懋柏高中物理教材中（《选修》Ｐ１４７、《甲种本》Ｐ２４０）对机械能守恒定律是这样表述的：“在只有重力做功的情况下，物体的动能和重力势能发生相互转化，但机械能的总量保持不变．”机械能守恒定律是力学中一条... Problems to be Noted in Using the Law of Conservation of Mechanical Energy The physics textbook for high schools in the Anyang City, Hubei Province (“Elective Selection” P147, “A Typebook” P240) is a statement of the law of conservation of mechanical energy: "In the case of gravity alone, The kinetic energy of the object and the gravitational potential energy are transformed into each other, but the total amount of mechanical energy remains unchanged.” The law of conservation of mechanical energy is a part of mechanics...