Definition
Velocity
In physics, velocity is defined as the speed and direction in which an object moves.
It is a vector quantity and has both magnitude (speed) and direction.
The SI unit of velocity is the meter per second (m/s).
In the example above, "60 miles per hour" is a speed (a scalar quantity), whereas "north at 60 miles per hour" is a velocity (a vector quantity).
What happens when the direction or speed of a moving object changes?
It is called acceleration, which is the rate of change of velocity.
Related Conversion Tool