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本文从引力势能系统共有的观点出发，就ｍｇＨ势能项的来源作一探讨并论及势能的系统共有概念． 有一静止在地面质量为ｍ的物体，被抛射向空中．如右图所示，地球质量为Ｍ，半径为Ｒ，物体与地心距离为ｒ，设物体沿地球半径Ｒ的延长线方向即ｒ方向运动一位移元ｄｒ，地球万有引
This article starts from the point of view shared by the gravitational potential energy system and discusses the source of the mgH potential energy term and discusses the system shared concept of potential energy. There is a body with a mass m on the ground that is projected into the air. As shown in the figure on the right, the mass of the Earth is M, the radius is R, and the distance between the object and the center of the earth is r. Let the object move along the direction of the extension of the Earth’s radius R, that is, the r direction, a displacement element dr.