Skip to main content

Illustration Stokes friction force acts on a falling particle in a liquid

Stokes friction force acts on a falling particle
Get illustration

Share — copy and redistribute the material in any medium or format

Adapt — remix, transform, and build upon the material for any purpose, even commercially.

Sharing and adapting of the illustration is allowed with indication of the link to the illustration.

Stokes friction force \(\boldsymbol{F}_{ \text R}\) describes the friction of a spherical paricle with radius \(r\) moving in a liquid having viscosity \(\eta\). The paticle moves with velocity \(v\) in this fluid. The Stokes friction force \(\boldsymbol{F}_{ \text R}\) acts anti-parallel to the velocity \(\boldsymbol{v}\). The velocity may be caused, for example, by the gravitational force acting on the particle.