Question

The system of the collinear and the parallel force for the bodies over which this theorem is to be applied are simplified as:

(a) The simplified collinear force system gives us a net force and the parallel force system gives us a simplified force, and then we add it vectorially

(b) Such simplification is not possible

(c) The simplification is usually done by not considering the directions of the both

(d) The simplification is done by considering the rotations only

This question was posed to me in an online interview.

My doubt is from Theorem of Pappus and Guldinus in division Centre of Gravity and Centroid of Engineering Mechanics

Answer 1

Right choice is (a) The simplified collinear force system gives us a net force and the parallel force system gives us a simplified force, and then we add it vectorially

Best explanation: The simplification is easy. The simplified force system gives us a net force and the parallel force system gives us a simplified force, and then we add it vectorially. Thus the vector addition at the last can be easily done and thus both can be simplified.