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Confidence votes 317. Inertia is rotary momentum; an object's ability to continue spinning when a decelerating force is applied. Just as a heavy object takes more effort to stop from the same speed as a light object, so does a heavy object take more effort to stop from turning at the same speed as a light object. So assuming they are turning at the same angular velocity, the heavier one has a larger inertia.
Newtonâs Laws - 2. In the physics sense of the word, inertia refers to laziness or the resistance to change to the state of the motion of an object. In the everyday sense of the word, inertia refers to a habit or a rut â resistance to change is difficult.