Check this out!

This is a really cool simple machines site;

http://www.pkphysicalscience.com/article/427/all-about-simple-machineslogin?username=thealberta&password=library



Simple Machines videos

https://www.youtube.com/watch?v=TS77oMc7l2Q

https://www.youtube.com/watch?v=Kg_vZ2pgQE

shttps://www.youtube.com/watch?v=Y31DtT3Hbog