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Stokes' law describes sedimentation of particles in liquids and can be used to measure viscosity. Particles in liquids achieve terminal velocity quickly. One can measure the time it takes for a particle to fall a certain distance and then use Stokes' law to calculate the viscosity of the liquid. Suppose a steel ball bearing (density $7.8 \times 10^{3}\textrm{ kg/m}^3$ , diameter 3.0 mm ) is dropped in a container of motor oil. It takes 12 s to fall a distance of 0.60 m. Calculate the viscosity of the oil.
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Final Answer
$0.76 \textrm{ kg/m}\cdot\textrm{s}$
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OpenStax College Physics Solution, Chapter 5, Problem 28 (Problems & Exercises) (4:36)

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