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Pench (screw) is a simple machine. How it works ?

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It is a simple tool which is used to join (fasten) two parts, it is called a screw. It is made of a cylindrical rod of metal by cutting spring like threads over it. It has a head which can be rotated to fasten it. Generally, in order to fasten a screw one needs to rotate it in clockwise direction where as to unfasten a screw we need to rotate it in anticlockwise direction.

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