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A drawing pin having a broad head can be...

A drawing pin having a broad head can be easily fixed on a board. Explain, how.

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When the drawing pin is pushed into the board with the thumb, the applied force is spread out over head of the pin. As the pressure experienced is small, the thumb does not get hurt. The same force, however acts at the tiny area of the pin point. The resulting high pressure forces the pin into the board.
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