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It is difficult to insert a blunt nail i...

It is difficult to insert a blunt nail in wooden block.

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The area of the blunt end of a nail is more than that of the sharp end of that nail. As the area of cross-section is more, for given value of force the pressure on it is less. Thus, the pressure produced on blunt end is less. Hence, it is difficult to insert a blunt nail in wooden block.
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