Here's why:

* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.

* Motion is simply the act of changing position over time.

Think of it this way:

* You can be moving (in motion) at a constant velocity (e.g., driving straight down a highway at 60 mph).

* You can also be in motion with a changing velocity (e.g., accelerating your car, turning a corner, or slowing down).

Changes in motion that *affect* velocity include:

* Change in speed: Increasing or decreasing the speed of an object changes its velocity.

* Change in direction: Changing the direction of an object's motion, even if the speed remains constant, changes its velocity.

Therefore, any change in speed or direction will result in a change in velocity.