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en.wikipedia.org/wiki/Lever

A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum .... This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: Class 1: ... is in the middle for the 2nd class lever, and the e ffort is in the middle for the 3rd class lever.

quatr.us/physics/types-lever-simple-machines-physics.htm

Aug 17, 2017 ... All levers fall into one of three types of lever. How can we tell which lever is in which class? Well, a first-class lever is a stick where the fulcrum is ...

www.enchantedlearning.com/physics/machines/Levers.shtml

Levers - a type of simple machine. ... Levers were first described about 260 BC by the ancient Greek mathematician Archimedes (287-212 BC). A lever is a ...

www2.phy.ilstu.edu/pte/489.01content/simple_machines/simple_machines.html

Resource Information for Teaching Simple Machines: Background ... First-class levers have the fulcrum located between the load and the effort (LFE). If the two ...

www.ee.nmt.edu/~tubesing/missionpossible/simplemachines.pdf

An example of how an Inclined Plane can be used to raise a mass to activate another simple machine. Inclined Plane. First Class Lever. Force pushing (or ...

www.school-for-champions.com/machines/levers_classess.htm

Jul 26, 2016 ... Explanation about the Three Lever Classes. ... Books. Top-rated books on Simple Machines ... www.school-for-champions.com/machines/