Question

The simplification of the forces on the free body diagrams is done as __________

(a) A particular system of rule is followed

(b) No simplification of the forces is possible

(c) The forces are already simplified and don’t need simplification

(d) The forces are very tentative quantity on terms of simplification and hence no simplification possible

This question was addressed to me in exam.

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

Answer 1

The correct choice is (a) A particular system of rule is followed

To elaborate: A particular system of the rules is followed that is if the upward direction is taken as positive then the downward direction is taken as negative. This is same as done with the couple in the 2D. That is the forces can be easily simplified. If taken in the vector form then the task is even easier.