Today, I found a tack in my room. As I was pushing against my cork board, I became aware that the pressure is greater at the tip of the tack, than at the blunt end. One would think that it is just because of the pointy end, but it's a little more than that. The area in the blunt end is greater than at the pointy end. This makes pressure decrease in the blunt end. The equation for pressure is force per area. This means that even if the same force is applied, if the area is greater, the pressure created will be decrease. This is why putting force at the blunt end of a tack hurts less and creates less pressure on the finger.
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