Definition -
Inertia is the resistance of an object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an outside force.
The First Law of Motion says that:
Every body perseveres in its state of being at rest or of moving uniformly straight ahead, except insofar as it is compelled to change its state by forces impressed.
or
Every object stays at rest or stays moving at the same speed unless something makes it change.
Inertia is the resistance of an object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an outside force.
Example of inertia -
For example, a rubber ball will not start bouncing around unless someone picks it up and throws it. Basically, if an object is not moving, it won't start moving unless something else acts upon it. The same idea can be applied to motion: an object in motion will stay in motion unless some outside, opposing force acts upon it. Inertia is also called Sir Isaac Newton's First Law of Motion.The First Law of Motion says that:
Every body perseveres in its state of being at rest or of moving uniformly straight ahead, except insofar as it is compelled to change its state by forces impressed.
or
Every object stays at rest or stays moving at the same speed unless something makes it change.
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