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| Levers |
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| A simple crowbar can be used to lift a heavy rock with a small effort. The crowbar is an example of a lever. |
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| The use of levers was known to the ancient Greeks, and it is reported that Archimedes once remarked "Give me a lever long enough and I will move the world" |
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| A lever is a rigid rod capable of rotating about a fixed point or axis called the fulcrum. |
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| Lever is one of the most common and simplest of all machines. |
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| A force called the effort is applied at one point on the lever and this overcomes a force called the load at some other point. It may here be noted that the terms 'effort' and 'load' are used in connection with all machines and are not confined only to levers. |
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| A lever is actually a class of simple machines where the turning effect or moment of a small force is used to overcome a large weight or resistance. |
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| Levers are divided for convenience into three classes depending upon the relative positions of the load, effort and fulcrum. |
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Force Work Power Energy and Machines
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