Movable Pulleys - Simple Machines for Kids - What are pulleys? How do pulleys work?
SIGN IN / SUBSCRIBE TO KIDIPEDE
LOG OUT


Movable Pulleys

Bike hoist pulleys
Bike hoist pulleys

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:

Fixed pulleys
Learn by doing - pulleys

To find out more about simple machines, check out these books and games from Amazon.com or from your library:

Machines
Physics
Chemistry
Biology
Science for Kids home page
Kidipede home page



Copyright 2012-2014 Karen Carr, Portland State University. This page last updated 2014. Powered by Dewahost.
About - Contact - Privacy Policy - What do the broom and the mop say when you open the closet door?
-->