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Law of inertia, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This law is also the first of Isaac Newton’s three laws of motion. The law of inertia states that an object remains in either a state of rest or motion unless an external force acts on it. Newton’s First Law of Motion, also known as the Law of Inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This law explains the natural tendency of objects to resist changes in their state of motion. Learn about the law of inertia, also known as Newton's first law of motion, which states that an object will remain in rest or motion unless acted by an external force. Explore the types of inertia, Galileo's experiments and examples of inertia in everyday life.
