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Inertia

Inertia is the tendency to do nothing or stay still. Inertia is not a force unlike friction.

According to the first law of motion. Something in uniform motion will stay moving and something that isn't moving will stay UNLESS a force moves or stops it. Inertia is like the tendency to stay still or to resist forces.

When you place a book on the ground it stays, of course it does. Since the first law of motion says an object will stay still unless acted upon by a force. The book has a tendency to stay still. If you put a force on it, you know what happens. To review inertia is the tendency of an object to stay still.

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