* Speed is the magnitude of velocity. It tells you how fast an object is moving.
* Velocity is a vector quantity. It includes both speed and direction.
Example:
Imagine a car driving around a circular track at a constant speed of 60 mph. Even though the car's speed is constant, its velocity is constantly changing because its direction is constantly changing.
Key takeaway:
For velocity to be constant, both speed and direction must remain constant. If either one changes, the velocity changes.