#### 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.

We suggest you list the important points in this screencast as a way to increase retention.

##### 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.