Question

Why pins and nails are made to have pointed ends.

Answer 1

To reduce area, since area is inversely proportion to pressure. Therefore, less area is more pressure Therefore, to produce more pressure that's why they have pointed ends.

Answer 2

So that the sharp edge can pierce through the object.

Scientific reason:
When pleasure is applied on a large surface and point size surface the relative pressure is greater experienced on the object being pressurized by point sized area.

Hope it helps!☺