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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.
Inertia is the tendency of an object to resist any change in its motion. Two objects with the same mass and same velocity will both have the same amount of inertia. However, if they have different velocities, they will have different amounts of inertia. Consider two trains, one moving at 100 kilometers per hour, and the other moving at 120 kilometers per hour.