This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Drag Forces
-- Oppose motion of an object through a fluid (liquid or gas). 2 Approximate Force Laws: Linear drag: fd = bv fd v
(rel. to fluid) low speeds, viscous fluids (biological microorganisms)
2 Quadratic drag: with D =
1 2 fd = Dv Cd A high speeds, low viscosity fluids (gases)
Fluid's density Object's "drag coefficient" Cd Object's front cross-sectional area A ...
View Full Document