# Speed

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Speed, abbreviated as s, is the rate of change or distance with time.  Speed is a scalar quantity having no direction.  Speed is not velocity, they do not mean the same thing.

## speed formula

 $$\large{ s = \frac{ d }{ t } }$$

### Where:

 Units English SI $$\large{ s }$$ = speed $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ d }$$ = distance $$\large{ ft }$$ $$\large{ m}$$ $$\large{ t }$$ = time $$\large{ sec }$$ $$\large{ s }$$

## Related Speed formula

 $$\large{ s = \frac{ 5252\; HP }{ \tau } }$$ (engine horsepower)

### Where:

$$\large{ s }$$ = speed

$$\large{ HP }$$ = horsepower

$$\large{ \tau }$$  (Greek symbol tau) = torque

Tags: Equations for Speed