Question

Newton’s law of viscosity relates

• A. Shear stress and viscosity
• B. Velocity gradient and pressure intensity
• C. Shear stress and rate of angular deformation in a fluid
• D. Pressure gradient and rate of angular deformation

Hint:

Newtonian fluids follow linear relation: shear stress ∝ velocity gradient.

Answer 1

The Correct Option is C

Newton’s law states: \( \tau = \mu \frac{du}{dy} \),
where \( \tau \) is shear stress, \( \mu \) is dynamic viscosity, and \( \frac{du}{dy} \) is velocity gradient or rate of angular deformation.