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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.