* Inertia: The Resistance to Change Inertia is the tendency of an object to resist changes in its motion. This means an object at rest wants to stay at rest, and an object in motion wants to stay in motion at the same speed and direction.
* Mass and Inertia: The amount of inertia an object has is directly proportional to its mass. The more massive an object is, the harder it is to get it moving or to stop it once it's moving.
Examples:
* A massive truck: A loaded truck has a lot of inertia. It takes a lot of force to get it moving from a stop, and it takes a lot of force to bring it to a stop once it's moving.
* A small ball: A small ball has less inertia. It's easier to get it moving and easier to stop it.
In summary: The greater the inertia of an object, the more resistant it is to changes in its motion, whether it's starting, stopping, or changing direction.
