Movable Pulleys - Simple Machines - What are pulleys? How do pulleys work?
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Movable Pulleys

Bike hoist pulleys
Bike hoist pulleys

November 2016 - A movable pulley is a way to use a pulley to make it easier to move heavy things - to get a mechanical advantage. In the picture, someone is trying to pull their bike up to the ceiling so it will be out of the way. They've used two fixed pulleys, attached to the ceiling, and two movable pulleys, hooked on to their bike.

The fixed pulleys make it easier to pull the bike up, by changing the direction of force so he can pull down instead of having to lift the bike up. But the movable pulleys give him a mechanical advantage too:

Here's a video of someone actually using a bike hoist:

Learn by doing - pulleys
Fixed pulleys
More about simple machines

Bibliography and further reading about simple machines:

Machines
Physics
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Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram or Twitter, or buy her book, Vandals to Visigoths.
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