Why does head of a thumbtack broad and the head of a pin is short
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Explanation:
The tip of pin is sharp to have ease in penetrating it. It is made thiner and sharper so that it acquire less area so that amount of force is required is minimised. Exactly opposite at other at head to prevent it from penetration.
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The head of the thumbtack is broad while the head of a pin is small because we don't want the thumbtack to pierce in our fingers as it is meant to be applied by our thumb.
- While the pin is hammered as compared to the thumbtack so its head is comparatively smaller than the thumbtack so there is no necessity for the pin to have a broader head.
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