Question

why does a nail have pointed tip

Answer 1

Pointed ends occupy a very small area , as a result of which the pressure ( = force / area ) on the walls/ objects due to the applied force is more and pins / nails can easily pierce.

...:-):-):-)

Answer 2

Pointed ends  which the pressure ( = force / area ) on the walls/ objects due to the applied force is more and pins / nails can easily pierce.

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