Speed

* Definition: Speed is how fast an object is moving. It's a scalar quantity, meaning it only has magnitude (a numerical value).

* Example: A car traveling at 60 mph.

* Focus: Only on how fast something is moving.

Velocity

* Definition: Velocity is how fast an object is moving *and* in what direction. It's a vector quantity, meaning it has both magnitude and direction.

* Example: A car traveling 60 mph *eastward*.

* Focus: On both the speed and the direction of motion.

Key Differences

* Direction: Velocity includes direction, while speed does not.

* Change: Velocity can change even if speed is constant. If the direction of motion changes, the velocity changes. Imagine a car going around a roundabout at a constant speed: its velocity is constantly changing because its direction is constantly changing.

An Analogy

Think of it like this:

* Speed: How much you're pushing on the gas pedal.

* Velocity: Where you're going and how much you're pushing the gas pedal.

In Summary

While both speed and velocity describe motion, velocity is a more complete picture because it includes the direction of movement.