# Newtons law of viscosity - Fluid Mechanics

Q.  Newton's law of viscosity states that
- Published on 04 Aug 15

a. the shear stress applied to the fluid is directly proportional to the velocity gradient (du/dy)
b. the shear stress applied to the fluid is inversely proportional to the velocity gradient (du/dy)
c. the shear stress applied to the fluid is directly proportional to the specific weight of the fluid
d. the shear stress applied to the fluid is inversely proportional to the specific weight of the fluid

ANSWER: the shear stress applied to the fluid is directly proportional to the velocity gradient (du/dy)

#### Discussion

• Mangala   -Posted on 25 Sep 15
Newton's law of viscosity states that the shear stress applied to the fluid is directly proportional to the rate of shear strain or velocity gradient (du/dy). The fluid which obeys Newton's law of viscosity is called as Newtonian fluid. All gases are Newtonian fluids. The viscosity in Newtonian fluid is independent of the shear stress.

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