Note the second independent winch line extension on the upper pulley. This changes things a bit from simply counting how many line legs are returning to the pulling vehicle. Some have stated that the “Spanish Burton” method was invented by Leonardo Da Vinci way back in the 1400’s. Would not surprise us if he did, Leonardo was the master at simple machines and kinematics. Check out some of his early sketches of pulleys – he was the man!
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In this case assume no parasitic frictional losses. The vehicle winch reels in 1 foot of rope at 5000 pounds of winch load.
1- What is the net pulling force to the vehicle?
2- The winch pulled in a foot of rope but how far did the vehicle actually travel?
3- What is the mechanical advantage ratio?
HINT: Remember the principle of Conservation of Energy