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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.
The larger the mass of an object, the greater the force it will exert on other objects. But as the distance from that object becomes greater, the gravitational pull becomes sm â¦ aller. For example, the sun has a larger mass than the earth, so gravity on the suns surface would be much greater than on earths surface.