Speed
* Definition: How fast an object is moving.
* Measurement: Measured in units like meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
* Scalar Quantity: Only has magnitude (size).
* Example: A car traveling at 60 mph.
Velocity
* Definition: How fast an object is moving *and* in what direction.
* Measurement: Measured in the same units as speed (m/s, km/h, mph) but always includes a direction.
* Vector Quantity: Has both magnitude and direction.
* Example: A car traveling at 60 mph *east*.
Key Differences
* Direction: Velocity includes direction, while speed does not.
* Representation: Speed is a scalar (just a number), while velocity is a vector (a number with a direction).
Analogy
Think of it like this:
* Speed: You're driving down a road, and the speedometer shows 60 mph.
* Velocity: You're driving down a road, and the speedometer shows 60 mph *east*.
In Conclusion
While speed tells you how fast something is moving, velocity tells you how fast it is moving *and* where it is going. Velocity gives a more complete picture of an object's motion.
