Here's why:
* 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 a constant speed and direction.
* Mass is a fundamental property of matter that measures the amount of matter in an object. The more mass an object has, the more matter it contains.
The relationship between mass and inertia is directly proportional:
* More mass = More inertia
* Less mass = Less inertia
Therefore, a massive object will be harder to start moving and harder to stop once it's moving, compared to a less massive object.
