Basic concept of inertia
The nature of an object that remains stationary or in a uniform linear motion state is called inertia. Inertia is an intrinsic property of an object. It is expressed as the degree of impedance of an object to its motion state. Quality is a measure of the inertia of an object. When the external force acting on the object is zero, the inertia is expressed as the object keeps its motion state unchanged, that is, it remains stationary or linear motion at a constant speed; when the external force acting on the object is not zero, the inertia appears as an external force to change the motion state of the object. The difficulty level. Under the same external force, the mass of the object with smaller acceleration is larger, and the inertia of the object with larger acceleration is smaller. Therefore, the inertia of an object will not change at any time (by external force or by external force), and will not change under any circumstances (still or motion). Inertia is an attribute of matter itself.