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Question

It is better to use a sharp tipped nail than a blunt nail because:

A
the tip with the smallest area will produce a higher pressure when a small force is applied
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B
a sharp tipped nail needs a larger force to drive it into wooden surface
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C
the sharp tip saves cost as less raw materials are required to make such nails
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D
the sharp tip has a spiralling effect when the nail is hit on the head
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Solution

The correct option is A the tip with the smallest area will produce a higher pressure when a small force is applied
The pressure is defined as the force per unit area. i.e P=F/A
So the pressure depends on the force F and area A of contact.
As sharp tipped nail has very small area of contact than a blunt nail (not sharp), so it will give more pressure when a small force is applied.
Thus, option A can be correct.

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