Define Non concurrent force system. Why we find the position of Resultant in Non concurrent force system?
Sol.: In Equilibrium of concurrent force system, all the forces are meeting at point of body. But if forces acting on body are not meeting at point, then the force system is called as Non concurrent force system.
In concurrent force system we find the resultant and direction of it. Because all the forces meet at one point so resultant will pass through that point which is the position of resultant is already clear. But in the non concurrent force system we find magnitude, distance and direction of resultant from any point of body as forces are not meet at the single point they act on many point of body, so we do not know the exact position of resultant. For finding out the position of resultant we used concept of moment.