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# Stoke's Law (drag force)

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Equation / Last modified by KurtHeckman on 2015/09/08 01:49
`F_(drag) = `

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Stoke's Law (drag force) computes the force of drag based on the dynamic viscosity (`mu`) of the fluid (e.g. water or air), the radius of the spherical object (R), and the velocity (V).

The results are the force in Newtons.

## Dynamic Viscosity

The dynamic viscosity of air depends mostly on the temperature.

At 15 °C, the viscosity of air is 1.81 x 10^{-5} kg/(m·s), 18.1 μPa.s or 1.81x10^{-5} Pa.s.

## Applications

Stoke's law and equation has been found useful in low velocity (under 55 mph) environments such as the flight of a football. Note: a football is 6.8" across, and hence has a radius (R) of 3.4".

# See Also

# References

- Wikipedia - https://en.wikipedia.org/wiki/Viscosity

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**Stoke's Law (drag force)**, is listed in 1 Collection.