Collinear: forces occure along a straight line
Vector: the sum of which is the algebric sum of the magnitude of the forces, acting along the sum line of action.
The vector: sum of all forces acting on it must equal zero, ensuring translational equilibrium : M fx =0; M fy =0; M fz =0
Kern area: is the central area of any horizontal sectio of a colum or walls
The polygon method: is a graphic technique for finding the vectors sum of a coplanar system of several concurrent forces by drawing to scale each force vector
Nonconcurrent force: they have lines of action that do not intersecr at a common point , tge vector sum of which is a single force that cuz sum traslation and rotation of a body.