Drag Force

F_{D} = \frac{1}{2} C_{D} ρ A v^{2}

Resistive force on object moving through fluid.

Variables

F_D

Drag force

Air resistance force

N

C_D

Drag coefficient

Shape-dependent constant

unitless

ρ

Fluid density

Density of fluid

kg/m³

A

Cross-sectional area

Projected area

m²

v

Velocity

Speed through fluid

m/s

Derivation

Derived from fluid dynamics and dimensional analysis.

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