Question

2.
Nails, pins and spikes have pointed ends so that they can be driven into the
surface with minimum effort.​

Answer 1

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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.

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The pin & nails have sharp ends to minimize the surface area so that pressure applied should increase the force of impact on the surface or wall.

Explanation:

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