A nail has a pointed tip so that when it is hammered, the force of the hammer is transferred to a very small area of the wood creating a large pressure that pushes the nail into the wood.
$$P = \dfrac{ F }{ A }$$
$$P$$: Pressure
$$F$$: Applied force
$$A$$: Cross-section area
Here we can clearly pressure is inversely proportional to the area of the object's surface.
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