1. A lever is a simple machine
consisting of a rigid rod pivoted at a fixed point called the fulcrum. It is
used for shifting or raising a heavy load or applying force in a similar way.
2. The word lever comes from the French
lever, means to rise.
3. "Give me a place to stand, and
I shall move the Earth with it" is a remark of Archimedes who formally
stated the correct mathematical principle of levers.
4. A body in which a force is felt is
called resistance (R) and the force applied here is called effort (E).
5. First order lever: IF the fulcrum
comes in between resistance and effort such levers are called 1st order
levers. Eg: Balance nail puller see saw,
a pair of scissors etc.
6. Second order lever: If resistance comes in between effort and
fulcrum then such levers are called 2nd order levers. Eg: Wheel barrow, nut crackers etc.
7. Third order lever: If effort is
between resistance and fulcrum such levers are called 3rd order levers. Eg: Pincers, Ice tongs, a pair of tweezers,
human mandible.
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