Question

The aircraft fly in the atmosphere due to which of the following principle?

(a) Archimedes principle

(b) Bernoulli’s principle

(c) Gravitational force

(d) Newton’s law of viscosity

This question was addressed to me in an internship interview.

My question comes from Infinitesimal Fluid Element topic in portion Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Correct choice is (b) Bernoulli’s principle

To explain I would say: Bernoulli’s principle states that the sum of all the forms of energy (potential energy, kinetic energy, internal energy) remains constant. Only the weight of the body and the pressure forces act on the body.