Exploring Motion: Newton's First Law of Motion
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In order for a moving object to stop -- or for an object at rest to move -- that object must overcome the force of inertia. The force that slows things down, produces heat, and wears things down is... (more info)

In order for a moving object to stop -- or for an object at rest to move -- that object must overcome the force of inertia. The force that slows things down, produces heat, and wears things down is called friction.

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