viscosity-and-shear-stress-screencasts

Explains what viscosity and shear stress are.

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Explains how to relate shear stress to velocity profile.

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Equation for the shear stress of a Newtonian fluid:

$τ = μ \frac{d u}{d y}$

where $τ$ is shear stress
$μ$ is the viscosity
$\frac{d u}{d y}$ is the rate of strain

$τ$ can also be found by dividing the tangential force on a surface by the area of that surface.

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