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Inertia is dependent on the mass of the object being considered, and sometimes by its momentum - depending on how we are using the term. Recall that inertia is the resistance of a body to a change in motion. (A body at rest tends to remain at rest unless acted on by an outside force. And, a body in motion tends to remain in motion unless acted on by an outside force.) We think of something massive as resistive to being moved. That's inertia. But it's not moving. If that same massive body is rolling, it will have a lot of momentum, and it will take a great deal of force to slow and stop it. In the first case, the object has no velocity, and will have no momentum. In the second case, it's moving, and it will have momentum.

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17y ago

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