stokes' law

Question

Drag force on small sphere in laminar flow is proportional to:

RankGuru · Accepted Answer

Stokes' Law states that the viscous drag force ($F_d$) acting on a small spherical body of radius $r$ moving with velocity $v$ through a fluid of viscosity $\eta$ is:
$F_d = 6 \pi \eta r v$
- The force is directly proportional to the **radius** ($r$) of the sphere.
- The force is directly proportional to the **velocity** ($v$) of the sphere.
This law assumes laminar flow (low Reynolds number) and that the fluid is infinite in extent.

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