Newton's First Law

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Isaac Newton, in the 17th century, put forth three laws that explain why objects move (or don't move) as they do and these have become known as Newton's three laws of motion. Newton's first law, the law of inertia, says: an object at rest will stay at rest unless an external force is applied to it; and an object in motion will not change its velocity, unless an external force is applied to it. Basically, this means that there is a natural tendency of objects to keep doing what they are doing.

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