# Is there any way to conserve energy for the following scenario of lifting weight?

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.

• I think that is what everybody is after when they are chasing for an implementation of free energy.
– NMech
Sep 13, 2020 at 16:12
• Work has the units of kg m^2/sec^2. This can be decomposed into force - Kg m/sec^2 - times distance - m. So no - force times distance is what work (energy change) is. 1/4 the force needs 4 times the pull distance to conserve energy. Sep 13, 2020 at 21:06