The fluids that are considered in this text:
(A) Have relatively low viscosities
(B) Must be subjected to a normal stress to have motion
(C) Have molecules that move relatively slowly
(D) Move when subjected to any shear stress
(D) Move when subjected to any shear stress
The fluids of interest in Fluid Mechanics always move when subjected to a shearing stress no matter how small that shearing stress may be.
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