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What is Newton’s first law of motion. Learn its definition, significance, and formula, along with everyday real-life examples, applications, and diagrams. The law of inertia states that an object remains in either a state of rest or motion unless an external force acts on it. Learn the definition and examples of inertia, the tendency of an object to remain at rest or in motion. Understand Newton's first law of motion, which states that a body remains at rest or in motion unless acted on by a net external force. Inertia is the natural tendency of objects to stay in motion or rest, unless a force acts on them. Learn about the origin and development of the concept of inertia, from Aristotle to Newton, and the different formulations of the first law of motion.