* Inertia: Inertia is the tendency of an object to resist changes in its motion. Think of it as "laziness" – the more inertia an object has, the harder it is to get it moving or to stop it once it's moving.
* Mass: Mass is the amount of matter an object contains.
The Relationship:
* More Mass = More Inertia: A larger mass means there's more matter, and therefore more resistance to changes in motion.
* Less Mass = Less Inertia: A smaller mass means less matter, and therefore less resistance to changes in motion.
Example:
* A bowling ball has a much larger mass than a tennis ball. This means the bowling ball has much more inertia. It's harder to get the bowling ball rolling, and once it's rolling, it's harder to stop.
Key Point: Mass is a fundamental measure of an object's inertia. The more mass an object has, the greater its resistance to changes in motion.
