# If compressibility force and surface tension force are neglected from the Newton’s second law of motion, which of the following equations result?

If compressibility force and surface tension force are neglected from the Newton’s second law of motion, which of the following equations result?

(a) Navier-Stokes equation

(b) Euler’s equation

(c) Bernoulli’s equation

(d) Reynolds equation

I have been asked this question by my college professor while I was bunking the class.

This intriguing question comes from Introduction to Fluid Dynamics in section Fluid Dynamics of Fluid Mechanics

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The correct choice is (d) Reynolds equation

The explanation: The Newton’s second law of motion comprises of 6 forces, namely, gravity, viscosity, pressure, turbulence, surface tension and compressibility forces. Reynolds equation comprises of 4 forces. Surface tension force and compressibility forces are neglected for finding Reynolds equation.

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