Inertia is directly proportional to mass. This means:

* Larger mass = Greater inertia

* Smaller mass = Smaller inertia

Inertia is the tendency of an object to resist changes in its motion. Think about these examples:

* Pushing a heavy box: It's much harder to get a heavy box moving (or stop it once it's moving) than a lighter box. This is because the heavy box has more inertia.

* Throwing a baseball: It's easier to throw a baseball than a bowling ball, because the baseball has less inertia.

Let me know if you have any other questions about inertia or mass!