Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?

Question

Blimpie

Physics

22 January, 01:39

Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?

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Bruce Blackburn · Answer 1

The force times the distance is the energy applied to the system. If it is easier to lift by a factor of 3, you will have to pull it 3 times further. That is 1/3 the applied force over 3 times the distance to conserve energy. So the rope is pulled 30 meters