The mass of an object

Related.

The motion state of a mass object is difficult to change, that is, the inertia is large; The motion state of objects with small mass is easy to change, that is, the inertia is small.

When you kick the ball, it starts to move. At this time, because the ball itself has inertia, it will keep rolling until it is stopped by external force.

Any object is inertial at any time and should keep its original state of motion.

Extended data:

What we usually call inertia refers to the relative position of an object.

frame of reference

Inertia, that is, when an object is not subjected to external forces, it has the ability to keep still with the reference system.

Linear uniform motion

Nature of. Therefore, the inertia of different inertial systems is different. In the inertial system, an object remains stationary because of inertia. In another inertial system of uniform linear motion, it refers to the state that an object keeps uniform linear motion due to inertia.

How does a stationary object move in a straight line at a uniform speed? It turns out that inertia may have different meanings in different inertial systems. Because everything is tense,

variable motion

, then the so-called inertial system.

It's here.

The choice is that any circular object can be an inertial system, and any object you choose can be an inertial system.

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inertia