Here are some activities to practice your knowledge of simple machines.

http://www.edheads.org/activities/simple-machines/frame_loader.htm

http://www.edheads.org/activities/odd_machine/

http://www.edheads.org/activities/eng_cell/

http://www.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm

http://staff.harrisonburg.k12.va.us/~mwampole/1-resources/simple-machines/index.html

http://www.mikids.com/Smachines.htm

http://www.mos.org/sln/Leonardo/InventorsToolbox.html

http://www.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm