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                      VOCABULARY



   force                              compound machine
    
friction                           gravity
    
simple machine            atmosphere
    
lever                              weight     
    
pulley                            orbit
    
wedge                           newton
    
inclined plane               buoyant force
    
wheel and axle             potential energy     
    
screw                            kinetic energy
    
input force                    astronomical unit (AU)
    
output force                  light year