Question

The main moto of the free body diagrams is to:

(a) To reduce the calculation

(b) To add the forces with the couples and take out the total

(c) To subtract the forces with the couples and take out the total

(d) To multiply the forces with the couples and take out the total

I have been asked this question in an interview.

This question is from Different Free Body Diagrams topic in portion Equilibrium of a Rigid Body of Engineering Mechanics

Answer 1

The correct answer is (a) To reduce the calculation

Explanation: The main moto of the free body diagrams is to reduce the calculation. The forces are simplified and the couples too are simplified. This gives us the total force and the total moment acting on the body. This gives us a single value of the respective thing and hence reduces the labour.