What is the difference between speed and velocity?
March 14, 2018 5:50AM
The difference between speed and velocity is that velocity is speed with a direction vector associated with it. It's that direction vector that makes them different.
Speed is displacement (distance traveled) per unit time. Velocity is displacement (distance traveled) per unit time in a given direction. The "directionality" associated with velocity makes it a vector quantity, while speed is a scalar quantity.
The main difference between them in everyday life is that "speed" is usually used
properly, but "velocity" is usually used Improperly.
-- "30 miles per hour" is a speed
-- "30 miles per hour north" is a velocity
-- "30 miles per hour north" and "30 miles per hour west" are the same speed but different velocities.