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Newton's First Law

An object at rest will remain at rest unless acted on by an external force. An object in motion continues in motion in a straight line at constant speed unless acted upon by an external force.

Newton's first law is sometimes referred to as the law of inertia.

Inertial is the characteristic of a mass to resist a change in motion. The second law quantifies the inertia as mass.

There are various ways of saying this, but ultimately is says that the motion of a body is unchanged unless it is acted on by a force.

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12y ago

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