Question

The net moment of the body is zero that means the distance between the force and the rotational axis is zero.

(a) The first part of the statement is false and other part is true

(b) The first part of the statement is false and other part is false too

(c) The first part of the statement is true and other part is false

(d) The first part of the statement is true and other part is true too

I have been asked this question by my school principal while I was bunking the class.

My question is taken from Conditions for a Rigid-Body Equilibrium in chapter Equilibrium of a Rigid Body of Engineering Mechanics

Answer 1

The correct option is (c) The first part of the statement is true and other part is false

For explanation I would say: The net moment of the body is zero that doesn’t mean that the distance between the force and the rotational axis is zero. This means moments caused by different forces cancels out. If this happens there is no motion of the body along with any direction and hence the body is said to be in equilibrium.