The beam is a beam with 2 levels of voltage resistance between a point and raengkratham to exert pressure to lift the end of the resistance, which will help lessen beams.
The second beam is a cantilever force between the rotation and force action. You will have to physically lift the end to overcome resistance. The beams of this type labor.
The beam level 2 beams with friction between the pivot point and the force action. To exert the straight lift end to overcome friction. The beam of this type will help your strokes.