## Drag Force

In fluid dynamics, drag (sometimes called air resistance or fluid resistance) refers to forces which act on a solid object in the direction of the relative fluid flow velocity.Unlike other resistive forces, such as dry friction, which is nearly independent of velocity, drag forces depend on velocity. Drag forces always decrease fluid velocity relative to the solid object in the fluid's path.

Types of drag are generally divided into the following categories:parasitic drag,form drag,skin friction, interference drag,lift-induced drag,wave drag (aerodynamics)or wave resistance (ship hydrodynamics).

## $$\frac{1}{2}*\mathrm{cda{v}^{2}}$$

Here,c = Coefficient of drag,d = density,a = effective cross-sectional area,v=speed.

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