Stokes' law (Excess force due to the difference of the weight of the sphere and the buoyancy on the sphere)

Description

The weight of an object is the force on the object due to gravity. Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. The excess force due to the difference of the weight of a spherical particle moving through a viscous fluid and the buoyancy on the particle, can be calculated by the mass density of the sphere and the fluid and the radius of the spherical particle.