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1什么是重心?“重心”一词的概念是什么呢?指的是把物体各部分受到的重力看为集中作用在某一点,这个点就是重力的作用点。重心的概念是力学概念,从力学的观点出发,一切物体都是由无数个小的质点组成,如果把人体作为一个质点系,那么,它也是由身体各个部分的质点所组成。那什么叫质点呢?所谓质点,就是把物体设想为没有大小形状,只具有一定质量的几何点。人体是由头、颈、躯干、上臂、下臂、手、大腿、小腿、足这些环节组
1 What is the center of gravity? What is the concept of “center of gravity”? It refers to the gravity that each part of an object receives as a concentrated action at a certain point. This point is the point of gravity’s effect. The concept of gravity is a concept of mechanics. From the point of view of mechanics, all objects are made up of countless small particles. If the human body is regarded as a particle system, then it is also made up of particles of various parts of the body. What is the mass point then? The so-called mass point, that is, the object is not the size of the shape, only a certain quality of the geometric point. The human body is composed of head, neck, trunk, upper arm, lower arm, hand, thigh, calf, foot