为了描述物体的机械运动,我们需要选取参考系,在不同的参考系中,对物体运动的描述也是不同的.参考系有两种,惯性参考系和非惯性参考系.惯性参考系是牛顿运动定律成立的参考系,非惯性参考系是牛顿运动定律不成立的参考系.在一切彼此做匀速直线运动的惯性系中,描述运动的力学规律完全是等价的.这就是力学的相对性原理.而在非惯性参考 In order to describe the mechanical motion of the object, we need to select the reference system, and the description of the object motion is also different in different reference systems.There are two kinds of reference systems, the inertial reference system and the non-inertial reference system.The inertial reference system is Newtonian motion The law of reference is established, and the non-inertial frame of reference is the frame of reference for the failure of Newton’s law of motion. In all the inertial systems that perform uniform linear motion with each other, the laws of motion describing the laws of motion are completely equivalent. While on non-inertial reference