Speed
* Definition: Speed is the rate at which an object covers distance. It's how fast something is moving.
* Measurement: Speed is measured in units of distance per unit of time (e.g., meters per second (m/s), kilometers per hour (km/h), miles per hour (mph)).
* Focus: Speed is a scalar quantity, meaning it only has magnitude (size). It doesn't care about direction.
* Example: A car traveling at 60 mph.
Velocity
* Definition: Velocity is the rate at which an object changes its position. It's how fast something is moving *and* in what direction.
* Measurement: Velocity is also measured in units of distance per unit of time (e.g., meters per second (m/s), kilometers per hour (km/h), miles per hour (mph)).
* Focus: Velocity is a vector quantity, meaning it has both magnitude (size) and direction.
* Example: A car traveling at 60 mph east.
Key Differences
* Direction: This is the crucial distinction. Velocity includes direction, while speed does not.
* Constant vs. Changing: An object can have constant speed but changing velocity if its direction is changing. For example, a car going in a circle at a constant speed has changing velocity because its direction is constantly changing.
In Summary:
* Think of speed as "how fast" and velocity as "how fast and in what direction."
* If you're just talking about how quickly something is moving, you're talking about speed.
* If you're talking about how quickly something is moving *and* in what direction, you're talking about velocity.
