Here's a breakdown:
* Inertia is the tendency of an object to resist changes in its state of motion. This means that 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.
* Velocity is a measure of an object's speed and direction.
* Change in velocity can be either a change in speed, a change in direction, or both.
Newton's First Law of Motion (also known as the Law of Inertia) states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Examples:
* A book on a table will stay at rest unless you push it.
* A car in motion will continue moving at the same speed and direction unless the brakes are applied or the steering wheel is turned.
The greater an object's mass, the greater its inertia. This means that it is harder to get a more massive object moving or to stop it once it is in motion.
