What is LEVER?

One of the simplest machines. It may be considered as a rigid beam pivoted at a point called the fulcrum, a load being applied at one point in the beam and an effort, sufficient to balance the load, at another. Three classes of lever may be distinguished: 1 fulcrum between effort and load; 2 effort between fulcrum and load; and 3 load between fulcrum and effort. See machine, mechanical advantage, velocity ratio,


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