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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.
Inertia. The larger the mass of the body the larger its inertia, in other words a heavy object would require a large driving force to make it initially move and a large force â¦ as well to make it stop moving or change direction. 1 person found this useful.