Question

The viscous force acting between two layers of a liquid given by $\frac{F}{A}=-\eta \frac{dv}{dz}$:

• A. pressure.
• B. longitudinal stress.
• C. tangential stress.
• D. volume stress.

Answer 1

Answer: (C)

tangential stress.

As we know that the newton's law of viscosity is given as $\tau =\frac{F}{A}=-\eta \frac{dV}{dZ}$

And we know that viscous force will act like a friction force between the layer of two fluid due to which shearing action will occur,and shear force will always act tangential to the plain of fluid/object. So, tangential stress will be generated between the layer of two fluid.