Question

why is the tip of an all pin made sharp ?

Answer 1

actually lesser the are will be more the perpendicular force is hence area and pressure is inversely proportional .... that's the reason

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Answer 2

If the tip of all the pin would be blunt then we would have to use more pressure and if the tip would be pointed we would have to use less pressure because pressure = force /area
this tells us that pressure is inversely proportional to force .