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物体由于地球的吸引而受到的力叫做重力,其计算公式为图1G=mg.其中g=9.8 N/kg为重力常数,表示质量为1 kg的物体受到的重力等于9.8 N,在精确度要求不高的情况下,我们一般取g=10 N/kg.重力的方向是特殊的,总是竖直向下.在地球表面及其附近,重力方向竖直向下就是指指向球心,因为地球是一个球体,所以地面上不同地方的重力方向是不同的.如图1所示.因为重力的方向总是竖直向下,所以它可以作为某一地方的方向标准.我们据此制作了检验方向的重垂线,即一根细线
The force due to the attraction of the earth is called gravitational force and is calculated as Fig. 1G = mg, where g = 9.8 N / kg is the gravitational constant, and the mass of 1 kg is equal to 9.8 N. When the accuracy requirement In the case of low, we generally g = 10 N / kg. The direction of gravity is special, always vertical downward. In the Earth’s surface and its vicinity, the direction of gravity down the vertical refers to the center of the ball, because The Earth is a sphere, so the gravitational direction is different for different places on the ground, as shown in Figure 1. Because the direction of gravity is always vertical downward, it can be used as the direction standard for a place. Test the direction of the heavy vertical line, that is, a thin line