where \(F_R\) is the resistive force on the sphere, \(r\) is its radius, \(\mu\) is the dynamic viscosity of the fluid, and \(v\) is the relative velocity between the fluid and the sphere. Notice that...where \(F_R\) is the resistive force on the sphere, \(r\) is its radius, \(\mu\) is the dynamic viscosity of the fluid, and \(v\) is the relative velocity between the fluid and the sphere. Notice that the Stokes's law force is of the form of a Model I resistive force described in Chapter 22 ( \(F_R \propto v\) ), with the resistance coefficient \(b=6 \pi \mu r\).
