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'''Newtonian Friction Law'''
 
</dt><BR/>The statement that the tangential force (i.e., the force in the direction 
of the [[Flow|flow]]) 
per unit area acting at an arbitrary level within a [[Fluid|fluid]] contained 
between two rigid horizontal plates, one of which is motionless and the other 
of which is in steady motion, is proportional to the shear of the fluid motion 
at that level. Mathematically, the law is given by ''<center>Τ = μ(
'''Missing Image:img src="SP7_n_files/partderiv.gif"'''u / '''Missing Image:img src="SP7_n_files/partderiv.gif"'''z)</center>''
where Τ is the tangential force per unit area, usually 
called the shearing stress; μ is a constant of proportionally called the 
dynamic viscosity; and '''Missing Image:img src="SP7_n_files/partderiv.gif"'''u/'''Missing Image:img src="SP7_n_files/partderiv.gif"'''z is the shear of the fluid flow normal to the 
resting plate. Also called ''Newton formula for the stress. ''[[/a>|/a>
]]
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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