Question

If five forces are acting on the single particle and having an angle of 72˚ between each and are collinear, then_____________

(a) The net force acting on the body is zero and the net work done is also zero

(b) The net force acting on the body is horizontal

(c) The net force acting on the body is vertical but net work done is non-zero

(d) The net force acting on the body is at an angle of 45

The question was posed to me during an internship interview.

This interesting question is from Work topic in chapter Principle of Virtual Work of Engineering Mechanics

Answer 1

The correct choice is (a) The net force acting on the body is zero and the net work done is also zero

The best I can explain: The net force acting on the body is zero. This means that the forces cancel out. This means that the body is in equilibrium and doesn’t need any of the external force to make itself in the equilibrium.