If you have a 20 lb weight and need to apply 80 lbs of tension using only pulleys and ropes?
In the context of a traction device, I need 80 lbs of Tension to straighten the bones of a broken neck. I only have 20 lbs of weight, some pulleys and rope. I need to use the pulleys and rope to turn the 20 lbs of weight into 80 lbs of tension. I also
.........__________
A----(O)_________(O)-------Tension 80lb
.... I
.... I
Weight
..20lb
The double block pulleys are secured at the anchor point 'A' .
Also secured is one end of a rope which loops