Three forces process

The three-force method is used in simple statics to determine the magnitude and direction of the third force when two forces are known in terms of magnitude and direction. The three forces method is a drawing method.

example

The three-force method can be used, for example, to approximate the forces that act on a line pole ( light chain pole, etc.). For this you first need a sketch ( top left ) and a map ( top right ). The " bird's eye view " was chosen for the site plan . Now the forces (red) are transferred to the bottom left in the correct angle ratio and the resulting force ( purple ) is determined by moving the forces in parallel. Since in a closed system it always applies that the sum of all forces must be zero, in this case the resulting force corresponds to the force sought, but in the opposite direction ( green ). However, the green force is a horizontal component (not the oblique force) as a reaction force.