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关于重力的来源,绝大部分资料上均说成：由于地球的吸引而使物体受到的力叫重力．但重力并不能等同于万有引力．重力和万有引力到底是什么关系呢?这要从地球的自转谈起．由于地球的自转,地球上的物体随地球自转而绕相对应的地轴做圆周运动,如图1,质量为m的物体绕O′点做半径为r的圆周运动．万有引力F的一个分力充当自转所需的向心力F_1．另一分力就是重力F_2．θ
Regarding the source of gravity, most of the data are said to be: The force of the object is called gravity due to the attraction of the earth. But gravity does not equate to gravitation. What is the relationship between gravity and gravitation? It must be started from the rotation of the earth. Due to the rotation of the earth, objects on the earth rotate around the earth’s axis in a circular motion, as shown in Figure 1. An object of mass m makes a circular motion of radius r around point O’. A force of gravity F acts as the centripetal force F_1 needed for rotation. The other component is gravity F_2. θ