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fulcrum
pivot point of a lever arm
lever
a bar, free to pivot around a point, used to move a load
load
the resistance of weight
effort
force applied to a simple machine to move load
class 1 lever
lever: fulcrum between load and effort
class 2 lever
lever: load is between fulcrum and effort
class 3 lever
lever: is between fulcrum and load
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