* Inertia is the tendency of an object to resist changes in its motion. It's directly proportional to the object's mass.
* Volume is the amount of space an object occupies.
Example:
Imagine a solid ball of lead and a hollow ball of plastic with the same volume. The lead ball will have a much higher mass due to its higher density. Therefore, the lead ball will have a much greater inertia, meaning it will be much harder to get it moving or to stop it once it is moving.
To summarize:
* Inertia depends on mass.
* Volume does not directly determine mass.
Therefore, two objects with the same volume can have very different inertias depending on their density and mass.
