Speed
* Definition: How fast an object is moving.
* Measurement: Scalar quantity (magnitude only). It's measured in units like meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
* Example: A car traveling at 60 mph. It doesn't matter what direction the car is going, only how fast it's moving.
Velocity
* Definition: How fast an object is moving *and* in what direction.
* Measurement: Vector quantity (magnitude and direction). It's measured in the same units as speed (m/s, km/h, etc.) but with a direction specified.
* Example: A car traveling at 60 mph *north*. The direction (north) is crucial.
Acceleration
* Definition: The rate at which an object's velocity changes. This can mean speeding up, slowing down, or changing direction.
* Measurement: Vector quantity (magnitude and direction). It's measured in units of meters per second squared (m/s²) or similar units.
* Example: A car accelerating from 0 to 60 mph in 5 seconds. This involves both a change in speed *and* a change in direction (assuming it starts from rest).
In a Nutshell:
* Speed: Just how fast something is going.
* Velocity: How fast and in what direction something is going.
* Acceleration: How quickly the velocity is changing.
Visual Analogy:
Imagine a car driving on a road:
* Speed: The speedometer reading.
* Velocity: The speedometer reading *and* the direction the car is pointed (north, south, etc.).
* Acceleration: The car's speed increasing (accelerating), decreasing (decelerating), or changing direction (turning).
