Pulley Force Diagram - continued

e. The weight supported by the hook at the top is equal to two times the value of F1. Why? Because it has to support the weight as well as the downward pulling force being applied. Therefore F3 = 2 x F1

f. In this example, if the rope is pulled by 1 ft, the weight rises by 1 ft. This is in line with the Law of Conservation of Energy:

Applied Energy = F1 x Distance

Work Done = W x Distance

g. In this case since the applied force is equal to the lifting force, the mechanical advantage is 1.