http://www.wacona.com/motion/motion.html
http://www.macomb.k12.mi.us/cc/Science/3rdGrade/3sciE.html
http://www.usoe.k12.ut.us/curr/science/sciber00/8th/forces/sciber/mania.htm
http://www.esc2.net/TIELevel2/projects/roller/
http://www.mos.org/sln/Leonardo/
http://www.exploratorium.edu/hockey/
http://www.usoe.k12.ut.us/curr/science/sciber00/8th/forces/sciber/potkin.htm
http://sunshine.chpc.utah.edu/javalabs/java12/machine/stdntovrvw.htm
http://www.edheads.org/activities/simple-machines/
http://www.mos.org/sln/Leonardo/Glossary.html#archimedes
http://express.howstuffworks.com/
http://weirdrichard.com/inclined.htm
http://www.smartown.com/sp2000/machines2000/main.htm
http://teacher.scholastic.com/dirtrep/simple/index.htm
http://www.bonus.com/bonus/scooter/scooterize.htmp?loc=http%3A%2F%2Fwww%2Ebonus%2Ecom%2Fcontour%2Fbeakman%2Fhttp%40%40%2Fwww%2Ebeakman%2Ebonus%2Ecom%2Fbeakman%2Flever%2Flever%2Ehtml&useragent=Mozilla%2F4%2E0+%28compatible%3B+MSIE+6%2E0%3B+Windows+NT+5%2E1
http://www.infocrumb.iwarp.com/machine.htm
http://www.usoe.k12.ut.us/curr/science/sciber00/8th/machines/sciber/intro.htm
http://personal.rockbridge.net/higs/sm/index.htm
http://www.kedt.org/asasite/MACHINES.htm
http://www.stemnet.nf.ca/CITE/dacta.htm
http://www.cosi.org/onlineExhibits/simpMach/sm1.html
http://207.10.97.102/elscizone/lessons/land/simplmachines/default.htm