15. PBS Teachersource - Mathline - Neighborhood Math
    PBS teacher lesson plans, online activities, classroom resources, and professional development projects are available at this public PBS education Web site.
    http: //pbs.org/teachersource/mathline/concepts...
    
    
16. ProTeacher! Simple Machines
    Simple Machines lesson plans for elementary school teachers in grades K-5 including pulleys , information about levers,inclined planes, screws experiments, classroom and teaching ideas.
    http: //proteacher.com/110064.shtml
    
    
17. SCREWS, SCREWS, AND MORE SCREWS!
    http: //weirdrichard.com/screw.htm
    
    
18. SIMPLE MACHINES
    
    http: //grc.nasa.gov/WWW/K-12/Summer_Training/K...
    
    
19. SIMPLE MACHINES
    
    http: //lerc.nasa.gov/WWW/K-12/Summer_Training/...
    
    
20. Simple Machines
    A machine is a tool used to make work easier. Simple machines are simple tools used to make work easier.
    http: //fi.edu/qa97/spotlight3/spotlight3.html
    
    
21. Simple Machines
    Learn about simple and compound machines while you explore the House and Tool Shed
    http: //edheads.org/activities/simple-machines/
    
    

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