frictional force"Same as friction; see also drag, drag coefficient, skin-friction coefficient.
If we make the simple assumption that the equivalent frictional force on the air is proportional to the wind velocity, say f = -kV per gram, then we can include this force with the pressure gradient and the Coriolis force.
Geostrophic winds exist in locations where there are no frictional forces and the isobars are striaght. However, such locations are quite rare. Isobars are almost always curved and are very rarely evenly spaced.
The shear tensor gives the force in directions parallel to the surface, usually due to viscous or frictional forces.
Geostrophic wind Theoretical wind which results from the equilibrium between horizontal components of the pressure gradient force and the Coriolis force (deviating force) above the friction layer. Only these two forces (no frictional force) are ...
 See also: Force, Friction, Air, Isobar, Gradient
  
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