Speed

* What it is: Speed tells you how fast something is moving.

* Measurement: It is a scalar quantity, meaning it only has magnitude (amount). We express speed using units like miles per hour (mph), kilometers per hour (km/h), or meters per second (m/s).

* Example: A car traveling at 60 mph.

Velocity

* What it is: Velocity tells you how fast something is moving and in what direction.

* Measurement: It is a vector quantity, meaning it has both magnitude and direction. We express velocity using units like meters per second east (m/s east), or kilometers per hour north (km/h north).

* Example: A car traveling at 60 mph due north.

Key Differences:

* Direction: Speed doesn't care about direction, but velocity does.

* Changes: A change in speed always means a change in velocity. But a change in direction *also* means a change in velocity, even if the speed stays the same.

An Analogy:

Imagine you're driving a car. You might have a constant *speed* of 50 mph, but your *velocity* is constantly changing as you turn corners or change lanes.