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一、重心是一个物体各部分受到重力作用的等效作用点由于地球的吸引而使物体受到的力叫重力,地面附近的所有物体各个部分都受重力作用·从效果上看,我们可以认为各部分受到的重力作用集中于一点,这一点叫物体的重心·引入重心概念之后,研究具体问题时,就可以把整个物体各部分重力作用用作用于重心的一个力来表示,这样,原来的一个物体就可以用一个有质量的点来代替(如图1所示),大大简化了对问题的研究·
1. The center of gravity is the equivalent point of gravity of each part of an object. Because of the attraction of the earth, the force on the object is called gravity, and all parts of the object near the ground are affected by gravity. From an effect point of view, we can think of each. Part of the gravity effect is concentrated in one point. This is called the center of gravity of the object. After the introduction of the concept of center of gravity, when the specific problem is studied, the gravity effect of each part of the entire object can be used as a force for the center of gravity. Thus, the original one The object can be replaced by a quality point (as shown in Figure 1), which greatly simplifies the study of the problem.