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  1. Why is one end of drawing board pin broad and that, whereas its other end is pointed and staip.

if you apply and force F on the drawing board pin then the also applies the same force F on the drawing board but owing to it's point tip ( less area ) the pressure generated it larger and the pin penetrates while the other end's area is kept larger so that you can easy apply force and the pressure developed on your hand by pin is smaller

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We know that Pressure is inversely proportional to area.

So, smaller area will exert more pressure, hence in a drawing pin one side is made sharp so that it can easily go inside a board and the other side is made pointed and staip so that it doesn't exert too much force on our hand.

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We know that Pressure is inversely proportional to area.

So, smaller area will exert more pressure, hence one side of a drawing pin has pointed end so that it can easily pierce into the board and the other have a pointed and staip side so that it doesn'e apply too much force on our finger.

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