1. The problem statement, all variables and given/known data Let a system of forces (F1,....Fn) act on a body at points (x1,....xn) respectively. Assume that the resultant or net force vanishes (sum of forces = 0) Show that the resultant torque of this system is independent of the choice of origin, i.e. for 2 different origins x0 and x0', we have T = T' where: T = [summation](xi-x0) X Fi and T' = [summation](xi-x0') X Fi 2. Relevant equations T = F X d 3. The attempt at a solution I have very little idea as to how to approach this problem, other than the T = Force X distance, and perhaps that the solution may have something to do with a bunch of couple moments that all equate to the same value, regardless of origin. Any help greatly appreciated!