When the fulcrum is located close to the load, a small force applied to the end of the lever bar farthest away from the fulcrum is magnified so that the lever bar easily moves the heavy load. The force is magnified when the long part of the lever bar moves through a great distance. The short part of the lever bar, located between the fulcrum and the load, moves through a much smaller distance.
There are three
types of levers: 1st Class, 2nd Class, and 3rd Class. The relative
position of the load, fulcrum and force determine the class of lever.
Professor Beaker's Learning Lab about Levers: Simple Machines
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