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The tendency of an object to do nothing unless an external force gives it a prod. In humans, a preference or disposition to remain inactive. Put simply, intertia means things like to keep doing what they're already doing unless prompted to do something else.
Inertia is one of Newton's laws of motion. An object in motion (or in rest) will stay in motion (or in rest) unless acted upon by an unbalanced force. You can think of it as if you were sitting in the seat of a car and the breaks get slammed on.. the idea of inertia is that, because you were in motion while in the car, you would continue to go in motion but the seatbelt or the dashboard stop you.

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