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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.
Definition of inertia. Isaac Newton is the one who formulated a great definition of inertia. Also known as Newton's first law or law of inertia, Newton restated Galileo's idea. Below is what Newton said in simple terms: If an object is already moving, it will keep moving in a straight line at constant speed unless a force stops it.