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Speed facts for kids
Speed  

Speed can be thought of as the rate at which an object covers distance. A fastmoving object has a high speed and covers a relatively large distance in a given amount of time, while a slowmoving object covers a relatively small amount of distance in the same amount of time.


Common symbols

v 
SI unit  m/s, m s^{−1} 
Dimension  L T^{−1} 
Speed is the distance that an object moves in a given amount of time. Speed is a measure of how fast something is moving. The average speed of an object in a certain time is the distance the object traveled divided by the time.
Finding speed
To find speed ,
where is the distance and is the time that has gone by.
Units of measurement for speed
There are many units of measurement for speed. For example, an object's speed can be measured in
 miles per hour (mph),
 kilometers per hour (km/h)
 meters per second (m/s), which is the SIunit for speed.
Changing speed
When an object changes speed, it gets faster or slower. If the speed of the object increases, it is called acceleration. If the object gets slower, and the speed decreases, it is called deceleration, or negative acceleration.