heglandpulley

**What is a pulley?** A pulley is a grooved wheel with a rope or chain rapped around it.

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 Pulleys and levers are similar. If you pull on a fixed pulley, the object rises. In other words; the pulley changes the direction of your input force that is what happens with with a first class lever. Instead of a bar, you apply your force to a rope. The center of the pulley acts like the fulcrum of the lever.



 The ideal mechanical advantage of a pulley system is is equal to the number of sections of the rope that support the object.

 __Examples Of A Pulley__  -crane  -winch  -elevator  -fishing pole  -dumb waiter  -flag pole  -pulling the bucket out of the well  -window washing platform  -garage door opener

 __Experiment to Try__ <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> -You would need a bucket, broom, string, and scissors. <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> -Have your friend hold the broom handle steady, using scissors,cut a lenght of string three times the distance from the broom handle to the floor. Use one end of the string to tie a knot around the broom handle. Place the bucket on then floor below the string. Pass the free end of the string throught the bucket handle. <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> Your fixed pulley is located at the bucket handle that moves freely when the string is raised and lowered.

<span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> media type="youtube" key="TlPWy7qW7oM" width="425" height="350" <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> __Websites To Check Out__ <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> - http://en.wikipedia.org/wiki/Pulley <span style="color: #ca1cca; font-family: Impact,Charcoal,sans-serif;"> -http://library.thinkquest.org/J002079F/pulley.htm