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If I drop a ball into viscous fluid (e.g. oil), by calculation I know that the fluid flow is laminar. So which equation do I need to calculate the drag force provided by fluid?
The drag equation, $$ F=\frac12\rho CAv^2 $$ where $ρ$ is the density of fluid, $C$ is drag coefficient, $A$ is cross-sectional area of ball, and $v$ is the velocity of ball.
Or the Stoke's law, which is $$ F=6\pi\eta rv$$ where $\eta$ is the viscosity of fluid, $r$ is radius of ball, and $v$ is velocity of ball.