Question

What forces are exerted on the body by a fluid flow?

(a) Pressure force

(b) Shear stress

(c) Pressure and shear stress

(d) Lift force

This question was posed to me by my school principal while I was bunking the class.

I'm obligated to ask this question of Jet Propulsion Engine Thrust in section Integral Form of Conservation Equation for Inviscid Flow of Aerodynamics

Answer 1

Correct option is (c) Pressure and shear stress

Best explanation: When a body is kept in a stream of fluid flowing over it, there are two forces exerted. One is the pressure distribution and the other is the shear stress distribution. This leads to formation of lift or drag.