A lever is a simple "machine" known since ancient times.



(1) lever

(2) fulcrum (pivot)

(3) load (mass being moved)

(4) effort (force applied to move load)


length of the lever =

= (distance between load and fulcrum) + (distance from fulcrum to effort)


(load) * (distance between load and fulctrum) =

= (effort) * (distance between fulcrum and effort)


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