Question

3.
State Stokes' law of viscous force. Derive the expression for viscous force
acting on a sphere falling through a viscous liquid, using dimensional
analysis.​

Answer 1

Newton's law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity.