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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.
Best Answer: According to Newton, gravity and inertia are the two factors that work together to keep planets in orbit. Inertia is the tendency of the object to resist change in its motion, so once its moving it wants to stay moving in a straight line.