center of mass

…[Minoru Nakaoka] (2) Center of gravity in mechanics The point at which the resultant force of gravity acts on each part of an object. It is also called the center of mass. If the total mass of an object is M , the acceleration of gravity is g, and the center of gravity is G, then the resultant force of gravity acts on G with a force of magnitude Mg . Therefore, if the point directly above point G is supported by a force of Mg pointing upward, the object will be in balance. …

*Some of the terminology explanations that mention "center of mass" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…【中岡 稔】(2)力学の重心center of gravity　物体の各部分に作用する重力の合力の作用点。質量中心center of massともいう。物体の全質量をM，重力の加速度をg，重心をGとすると，重力の合力はGに働く大きさMgの力になるから，G点の真上を上向きにMgの力で支えれば物体はつり合う。…

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