Question

Rotational moments are not counted in the free body diagrams and the evaluation of the internal forces by the method of sections.

(a) True

(b) False

The question was posed to me during an online interview.

Asked question is from Internal Forces Developed in Structural Members topic in division Internal Forces of Engineering Mechanics

Answer 1

Right choice is (b) False

The explanation is: In the method of sections the determination of the forces is done over the trusses or the beams. It is not done on the joints. But yes the joints are used as the forces acting on the joints are used in the calculations. This is again used for the designing of the beams.