Question

Surface forces includes _________

(a) pressure and shear stress

(b) point force

(c) body force

(d) gravity

The question was posed to me during an online interview.

I need to ask this question from Finite Control Volume Approach topic in division Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Correct option is (a) pressure and shear stress

To explain: Pressure force and shear stress acts on the complete surface of the body which means that the surface force acts on the surface and not on a point or the body. Surface forces may act either on external or on an internal surface of the body.