Principle of Moments:
It states, “If a number of coplanar forces are acting simultaneously on a particle, the algebraic sum of the moments of all the forces about any point is equal to the moment of their resultant force about the same point“.
Moment of Force:
It is the turning effect produced by a force, on the body, on which it acts. The moment of a force is equal to the product of the force and the perpendicular distance of the point, about which the moment is required and the line of action of the force.
Mathematically, moment,
M = P x l
Where,
P = Force acting on the body
l = Perpendicular distance between the point, about which the moment is required, and the line of action of the force.