How is inertias involved in newtons first law of motion?

Answer 1

that an object at rest will remain at rest

Inertia explain many common events. For example, if you are in a car that stops suddenly,inertia causes you to continue moving forward

Answer 2

Inertia is the tendency of an object to maintain its state of rest or uniform motion unless acted upon by an external force. This concept is fundamental to Newton's First Law of Motion, which states that an object will remain at rest or in uniform motion unless a net external force is applied to it. In other words, inertia is the reason why objects resist changes in their motion.

Answer 3

an object will stay at motion if it was originally at motion, and object will stay at rest if it was originally at rest