To calculate the effort required to lift the load we divide the load by the number of ropes (do not count the rope that goes to the effort). The image on the right shows a four pulley system. The person lifting the 200kg load experiences a pull equal to only 50kg (200kg/4).
When Madero was murdered in February 1913, Carranza drew up the Plan de Guadalupe, a purely political plan to oust Huerta. Carranza became the leader of northern forces opposed to Huerta. He went on to lead the Constitutionalist faction to victory and become president of Mexico.
