* Velocity is a vector: Velocity is not just about how fast something is moving (speed), but also about the direction it's moving in. It has both magnitude (speed) and direction.

* Changing direction changes the vector: Even if the speed remains the same, changing direction means you're changing the velocity vector.

* Acceleration: Changing velocity (either speed or direction) means that the object is accelerating. Acceleration is the rate of change of velocity over time.

Example:

Imagine a car traveling at 60 mph east. If the car turns north while maintaining 60 mph, its speed remains the same, but its velocity changes because the direction has changed.

Key takeaway: Velocity is a vector quantity, and a change in direction, even with constant speed, constitutes a change in velocity.