1重力说刚体的重心,自然要从重力说起.那么,何为物体所受重力呢?在研究地球上和地球附近一般物体的运动时,相对于太阳-恒星系平动的地心系不但是一相当好的惯性系,而且只需考虑物体所受地球的万有引力(当然,如果物体受到其他主动力和约束力,则这些主动力和约束力还是要考虑的),因物体吸引地球而使物 1 Gravity says that the center of gravity of a rigid body naturally starts with gravity, so what is the gravitational force on an object? When studying the motion of a general object on Earth or near Earth, the geocentric system is not moving relative to the Sun-Stellar system But a rather good inertial system, and only needs to consider the gravitation of the Earth on the object (of course, if the object is subject to other motive forces and bindings, these motive forces and binding forces should still be considered), because the object attracts the Earth Things