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The lever family

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on 30 October 2013

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Transcript of The lever family

The lever family
Simple lever
: A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force.
: A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.
Wheel and axle
: simple machine for lifting weights: a simple machine, often used to raise or lower loads, usually consisting of a cylindrical drum and wheel mounted on the same axle with ropes wound around each
Simple lever
The first member of the lever family is the simple lever. The lever is helpful because if we did not have a lever on a seesaw we would just stay balanced on it and it would’t be fun.

An example of a pulley is a crane. A crane is a pulley because Cranes are large construction machines that are used to lift heavy objects. They have a pulley at the top of the pole that pulls up the load.

The axle of a Ferris wheel is the part that the wheel spins around. It is in the center of the whole construction. So when you say Ferris wheel you don't say Ferris wheel and axle, you just say Ferris wheel.

wheel and axle
interesting facts
the lever is one of the simplest machine
with out the lever family we wouldnt be doing the stuff we do today or be using the stuff we use today.
There are three classes of levers. A class 1 lever has the fulcrum between the load and the force. A seesaw and hammer are good examples of class one levers. A class 2 lever has the load between the force and the fulcrum. A wheelbarrow and stapler are good examples. In a class 3 lever the force is between the fulcrum and the load like tweezers or tongs.
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