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Inertia is a fundamental concept in physics that describes the tendency of an object to resist changes in its state of motion. This means that an object will remain at rest or continue moving in a straight line at a constant speed unless acted upon by an external force. Inertia is the property of an object that quantifies its resistance to changes in motion. It is a fundamental concept that helps explain how and why objects behave the way they do when forces are applied or removed.