Question

What is the physical principle behind momentum equation?

(a) Newton’s second law of motion

(b) Newton’s first law of motion

(c) Zeroth law of thermodynamics

(d) First law of thermodynamics

I have been asked this question in a job interview.

Asked question is from Momentum Equation in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

Answer 1

The correct option is (a) Newton’s second law of motion

To elaborate: Momentum equation is derived using Newton’s second law of motion. This gives a relationship between force and acceleration. It also gives the condition for momentum conservation.