Engineering Asked on September 15, 2020
A pulley can be used to provide mechanical advantage while lifting weight.
Suppose a combination pulley is made such that in order to lift something four times heavier, one can use the same force but the rope needs to be pulled four times further. The rope needs to be pulled further in order to conserve energy.
But i was just curious if there is any system or arrangement which will follow the law of conservation of energy by which one could reduce the effort used to lift the load and on top of that will not have to pull the rope further.
If you use a counterweight like elevators do, the only energy you have to invest is that what is needed to overcome the mechanical friction plus what is needed to lift the elevators load. Ofcourse you would have to invest additional energy for the first use to get the counterweights up there and it obviously only works if whatever you lift you will drop again to use its mass to lift the counterweights up again.
Answered by Werner Heisenberg on September 15, 2020
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