Question

We apply the equations of ________ to determine various forces acting on the beams.

(a) Equilibrium

(b) Rotation moment

(c) Linear moment

(d) Translation

The question was asked in an interview for internship.

This interesting question is from Shear and Moment Equations and Diagrams in section Internal Forces of Engineering Mechanics

Answer 1

Correct option is (a) Equilibrium

To explain: The force developed by a support doesn’t allow the translation of its attached member. This is the basic condition for the equilibrium of the forces in any dimension. And many other are applied at the points where the forces are to be determined. Thus equilibrium equations are being applied at the points where the main forces are to be determined.