Newton's First Law of Motion
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it
This we recognize as essentially Galileo's concept of inertia, and this is often termed simply the "Law of Inertia".
This means that if you leave a book on your coffee table over night, when you return in the morning, unless an outside force moved it, it will be in the same place. This also means that if you kick a soccer ball, it will continue moving until it hits something. However we all know the ball will eventually stop even if it does not hit a wall -- this is because of the friction between the ball and the ground, and between the ball and the air.
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