NEWTON'S FIRST LAW OF MOTION: INERTIA
This law states that objects like to keep doing what they're already doing. If something is sitting still, it will stay still unless something makes it move (another force). And if something is already moving, it will keep moving in the same way unless something makes it stop or change direction.
Example 1: A ball will keep rolling on the floor until it bumps into an object or the friction between the ball and the floor slows it down.
Example 2: A book will keep sitting on a table until someone moves it.
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