A crowbar (left), that is supported and can turn freely on the fulcrum f, enables a man to create at b a force P that is greater than the force F that he exerts at a. If, for example, the length af is five times bf, the force P is five times F. A nutcracker (right), the two bars are connected by a pin joint at the fulcrum f; if af is three times bf, the force P at b is three times the force F exerted by the hands at a.