Speed

* Definition: How fast an object is moving.

* Measurement: Only magnitude (e.g., 60 miles per hour).

* Direction: Doesn't consider direction. A car traveling at 60 mph eastbound has the same speed as a car traveling 60 mph westbound.

Velocity

* Definition: How fast an object is moving and in what direction.

* Measurement: Both magnitude and direction (e.g., 60 miles per hour eastward).

* Direction: Crucial. A car traveling at 60 mph eastward has a different velocity than a car traveling 60 mph westward.

Analogy

Think of it like this:

* Speed is like the speedometer in your car. It tells you how fast you're going, but not which way.

* Velocity is like the speedometer plus a compass. It tells you both how fast you're going and where you're headed.

Examples

* Speed: You drive your car at 30 mph.

* Velocity: You drive your car at 30 mph due north.

Key Takeaway

Speed is a scalar quantity (only magnitude), while velocity is a vector quantity (magnitude and direction).