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The Concept Map you are trying to access has information related to:
The World of Science, PP 107-120, Ramps as in Screws, Ramps as in Stairs, Increase force to Lift things, Machines use Wheels, Increase force to Move things, Machines may use Many simple machines, Move objects with increased speed or distance, Levers use a Fulcrum, Levers can Move objects, Machines make Jobs easier