Crusader Education CRU512 Elementary Physics Kit Block and Tackle
One pulley can be used to change the direction of the force applied by a cord several pulleys can be used to make this simple machine. A small force on the cord can be used to lift a large weight.
Digg
del.icio.us
Facebook
Netscape
Furl
reddit
StumbleUpon
Slashdot
Squidoo
Technorati
Yahoo! My Web
netvouz
PlugIM
Blogmemes
Windows Live
Mister Wong