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Inertia is tendency of an object to stay at rest or in motion. Learn more about Newton's first law as it explains how forces acting on an object are related to the object's mass and motion through several examples and test your knowledge with quiz questions.
The law of inertia states that it is the tendency of an object to resist a change in motion. According to Newton, an object will stay at rest or stay in motion (i.e. maintain its velocity in modern terms) unless acted on by a net external force, whether it results from gravity, friction, contact, or some other source.