1. Education
Send to a Friend via Email

Discuss in my forum

Definition: Distance travelled per unit time. Speed is the scalar quantity that is the magnitude of the velocity vector.

The most common way to calculate the constant velocity of an object moving in a straight line is with the formula:

r = d / t

where

  • r is the rate, or speed (sometimes denoted as v, for velocity, as in this kinematics article)
  • d is the distance moved
  • t is the time it takes to complete the movement

The SI units for speed are m / s (meters per second).

  1. About.com
  2. Education
  3. Physics
  4. Physics Dictionary
  5. Physics: Q to T
  6. Speed - definition of speed

©2014 About.com. All rights reserved.