# Drag Force

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Drag Force

Drag force ( $$F_d$$ ) 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.

### Drag Force Formula

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

$$\large{ F_d = \frac { \rho v^2 C_D A} { 2 } }$$

Where:

$$\large{ F_d }$$ = drag force

$$\large{ A }$$ = cross section perpendicular to area flow

$$\large{ C_d }$$ = drag coefficient

$$\large{ \rho }$$  (Greek symbol rho) = density

$$\large{ v }$$ = velocity

Tags: Equations for Force