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描述物体的运动,可以根据研究问题的需要选择参照系,但是要注意:牛顿第一定律并非对任何参照系都成立.它成立的参照系,叫做惯性参照系,简称惯性系.反之,称为非惯性系.一切相对于惯性系加速运动的参照系都是非惯性系.在非惯性系中,引入惯性力的概念后,就可以利用牛顿第二定律的形式解决动力学问题.惯性力源于物体的惯性,是物体惯性在非惯性系中的体现.不过惯性力是一种假想的力,实际上并不存在.
Describe the motion of the object, you can choose the reference frame according to the needs of the research problem, but it should be noted: Newton’s first law is not established for any reference system. Its established reference frame is called inertial frame of reference, referred to as inertial frame. Otherwise, it is called Non-inertial system. All frames of reference relative to inertial system acceleration motion are non-inertial systems. In the non-inertial system, after introducing the concept of inertial force, it is possible to use Newton’s second law to solve dynamic problems. Inertial force originates from The inertia of an object is the manifestation of the inertia of the object in a non-inertial frame. However, the inertial force is an imaginary force and does not actually exist.