Speed
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Speed is the distance that an object moves in a certain amount of time. Speed is a measure of how fast something is moving.
Speed is a scalar.
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[change] Finding speed
To find speed s,
s = 
where d is the distance and t is the time that has gone by.
[change] 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 SI-unit for speed.
[change] Changing speed
When speed changes (the object starts moving faster), it is called acceleration. Decreasing speed is called deceleration, or negative acceleration.
[change] Other uses
- Some people use the word "speed" to refer to amphetamine and methamphetamine, which are strong stimulant drugs.
