Question

Why is it easy to hammer a nail and not a bolt

Answer 1

Hello!

Here is your answer!
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This happens beacuse:

Nail has a pointed end while a screw (bolt) has a blunt end. 

As surface area decreases, pressure increases. 

Since nail has less surface area when compared with a screw, it is easier to drive a nail into wood as pressure is more.
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Hope it helps!