#### 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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##### Important Equations:

Equation for the shear stress of a Newtonian fluid:

$\tau = \mu \frac{du}{dy}$

where $$\tau$$ is shear stress
$$\mu$$ is the viscosity
$$\frac{du}{dy}$$ is the rate of strain

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