Speed
* Definition: How fast an object is moving.
* Units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), etc.
* 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.
* Units: Same as speed (m/s, km/h, mph, etc.).
* Vector quantity: Has both magnitude (size) and direction.
* Example: A car traveling at 60 mph *east*.
Key Differences
* Direction: Velocity considers direction, while speed does not.
* Change in direction: If an object changes direction, even if its speed remains constant, its velocity changes.
Analogy
Imagine two cars:
* Car A travels at a constant speed of 50 mph in a straight line.
* Car B travels at a constant speed of 50 mph, but goes around a circular track.
Both cars have the same speed, but their velocities are different because Car B is constantly changing direction.
In summary:
* Speed tells you *how fast* something is moving.
* Velocity tells you *how fast* something is moving and *in what direction*.
