Non-coplanar Forces:
If the lines of action of forces do not lie in the similar plane, then the forces are called as non-coplanar forces. These forces can be concurrent or parallel as illustrated in Figures, respectively. Forces l¯, m¯, n ¯and o¯ are non-coplanar concurrent forces working in space, and forces. x¯, y¯ and z ¯are non-coplanar parallel fource.