Here is a very, very cool website that has an Interactive Game for Kids that uses Simple Machines!
This site is from the Lemelson Center (for the Study of Invention and Innovation) / Smithsonian Natural Museum of American History.
The site is for Grades K-8. (I think adults will like it too. I do!)
Students will have LOTS of FUN exploring and tinkering and learning how simple machines can be made from everyday objects.
Thanks for visiting! :)