pulleys

=All About the Pulley=

Description:
A pulley is a system that uses a cable and a wheel. It changes the direction of an applied force. For instance, you can pull on the cable of the pulley, and it will pull a  weight.



media type="youtube" key="TlPWy7qW7oM" height="344" width="425" A pulley is a wheel with a cord, rope, chain or something like it turning or being guided by a wheel. The effort pulls on one end making the load that is connected to the other side of the rope lighter. The wheel is important because it reduces friction making the load easier to lift or move. The wheel is always above the load but not always far above the effort. The wheel is connected to a pole, ceiling or anything that has a strong foundation. It can be connected to the anchor with a screw, rivet, nail or anything that will hold the load. A pulley is a a a  wheel with a a a  groove. A A A rope, belt, or cable runs inside the groove.One pulley can be used alone or connected with other pulleys in a a a  //pulley system//. The greater the number of pulleys in the system, the less force it will take to lift an object. That means if you have a lot of pulleys connected together - a very heavy object can be lifted very easily.

Uses:
The Pulley can be used to lift and move heavy loads, or to reach things not easily reached.

__Student Challenge __ in a real life situation || Image of example of use || lighter || ||
 * Name of student || Example of use
 * Hussein || pulleys help us in carrying stuff. || [[image:.jpeg width="427" height="309"]] ||
 * Kenny || Pulleys help pull heavy stuff || [[image:topulley.jpg width="300" height="287"]] ||
 * Joseph || Pulleys make things lighter. || [[image:IMG_0496.JPG width="300" height="225"]] ||
 * William || a crane pulls heavy things || [[image:william.2075jpg.jpg width="270" height="270"]] ||
 * Pashan || Pulley helps pull heavy things easliy. || [[image:pulley-simple_machine.jpg width="214" height="224"]] ||
 * Zion || pulleys help you lift things up without using lots of strength. || [[image:em-pulleyguy.jpg width="203" height="220"]] ||
 * Nicky ||  ||   ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Rical || pulleys make it easer to lift hevy things up. || [[image:PULLEY_1.jpg width="284" height="213"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Matthew || A pulley helps you lift heavy things. ||  ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Felix || A pulley helps you lift things and make the stuff you are lifting lighter. || [[image:Levers-and-pulleys_icon.jpg]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Wendell || Pulleys pull things up. || [[image:moving-pulley.jpg width="219" height="293"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Tanaka || pulleys halp you laft havey obgoks || [[image:tanakawjpg width="280" height="296"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Andrew || A pully is a machine that uses 2 or more wheels and a peice or rope or sting || [[image:pulley.gif width="303" height="243"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Regan || it helps you pull up things. || [[image:http://cnx.org/content/m13594/latest/pulley.gif width="251" height="202"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Haadi || This helps you pull waght. || [[image:Haadi_hock.gif width="154" height="280"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Wayne || this is for pulling the curtain || [[image:DSC03042.JPG width="256" height="192" align="left"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Sky || A pulley helps || [[image:_skys_moving-pulley.jpg width="293" height="393"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Maya || A pulley makes things easier to lift. || [[image:Mayacompound_pulley.gif.jpg width="320" height="214"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Udita || A pulley helps to lift heavier things with less effort. || [[image:PULLEY.jpg width="137" height="182"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Joy || These two pulleys are different kinds of pulleys. || [[image:joypulley.jpg width="340" height="299"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Piper || Pulleys are used to make a yacht sail || [[image:Pulley.jpg width="225" height="168"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Bridget || A pulley is to make things easier to pull.(For example,blinds,fishing rod,crater) || [[image:pulley1.jpg width="203" height="150" align="left" caption="Thepulley"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Gloria || Some curtains have pulleys. || [[image:new_folder_004.jpg width="230" height="196"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Cassandra || Pulleys help humans because it makes carrying things
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Muneerah || A pulley is a machines that makes it easier for you to lift something heavy. ||  ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Keelan || Pullys help in your house too.By pulling up your blinds for morning. || [[image:IMG_1526.JPG width="364" height="238" align="right"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Kezialine || blinds have pullys || [[image:100_3854.JPG width="546" height="109"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Anya ||  || [[image:shoe_lace.JPG width="314" height="223"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Jasmine || If your moving use pulleys to help you move the heavy stuff. || [[image:jasmine.pulleys.gif.jpg]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Joyce || A pulley helps you by just pulling a rope to lift heavy loads || [[image:3094588-2-pulleys-and-cables.jpg width="330" height="245"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);">Astarlii || A pulley is a simple machine that you pull .The more pulleys you have the easier it is to lift a heavy load. || [[image:L_Pulley_dia4_100lb.gif align="left"]] ||
 * <span style="color: rgb(70, 0, 128); background-color: rgb(253, 231, 186);"> ||  ||   ||