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Lever One of the basic tools that date from prehistoric times. Simply a beam (lever) is used to move a load with a fulcrum (pivot) and an applied force. The position of the three determines the mechanical advantage.
- First Class Lever
- With this type of lever the fulcrum is situated between the load and the applied force.
 - Example: Pliers.
- Second Class Lever
- With this type of lever the load is situated between the fulcrum and the applied force.
 - Example: Nut crackers, wheel barrow
- Third Class Lever
- With this type of lever the force is applied between the load and the fulcrum.
 - Example: Tweezers.
Historical Notes - 260 BC The lever is first described by Archimedes. "Give me a place to stand, and I will move the Earth.", Archimedes
See also: Fulcrum, Pliers, Pulley.
  
Subjects:- Mechanical Engineering
- Physics
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