Speed and velocity both are used to be as the words meaning the same when used in normal day to day situations . However the physicists out there treat those as different and technically there are many differences between them . Below are the key differences between the two .
|Speed is defined as the rate of change of distance per unit time .||Velocity is defined as the rate of change of displacement per unit time .|
|Speed is a scalar quantity . It has only magnitude .||Velocity is a vector quantity . It has both magnitude and direction . The scalar absolute value (magnitude) of velocity is called "speed" .|
|When something moves in a circle and returns to its starting point, its average speed is circumference divided by time taken .||When something moves in a circle and returns to its starting point, its average velocity is zero .|
|Example : If a car is said to travel at 90 km/h, its speed has been specified.||If the car is said to move at 90 km/h to the south, its velocity has now been specified.|