* Inertia: Inertia is the tendency of an object to resist changes in its motion. The more massive an object is, the more inertia it has. Think of it like this: a heavier object has more "stuff" in it, so it takes more force to get it moving or to stop it.
* Newton's Second Law: This law states that the force (F) required to accelerate an object is directly proportional to its mass (m) and the acceleration (a): F = m * a. So, a larger mass means you need a larger force to produce the same acceleration.
In simpler terms: It's like pushing a shopping cart full of groceries versus an empty one. The full cart has more mass, so it's harder to start moving and harder to stop once it's going.
