# Drag Force

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

Drag force or drag for any body moving through a fluid (gas or liquid), is the force exerted perpendicular and in opposition to the direction of travel.

## formula

$$F_D = \frac {1} {2} \rho v^2 C_D A$$

Where:

$$F_D$$ = drag force

$$\rho$$ = density

$$v$$ = velocity

$$C_D$$ = drag coefficient

$$A$$ = area