We study the modification of the stress tensor to account for shear stresses,
and derive the Navier-Stokes equation of motion of the viscous fluid. Next we discuss
the problem posing for the viscous fluid model, and also consider the energy balance
together with the viscous dissipation of the kinetic energy.
Keywords: Dissipation of the kinetic energy, Dynamic viscosity, Energy balance,
Internal friction, Navier-Stokes equation, No-slip condition, Slip condition,
Viscous fluid, Viscous stress tensor.
