Question

porter's place a large round piece of cloth on their head why they carry heavy loads

Answer 1

Porters place a round piece of cloth on their head when they carry heavy lods as the round piece of cloth increases the area on which the load is placed. We know that when surface is more than pressure is less. As a result, the pressure on their heads get reduced.

Answer 2

Whe know that when the area of an object is larger the pressure is able to distribute more widely over the surface

Thus, when the porter ties a round cloth over his head the pressure is distributed over the cloth thereby reducing the weight on his head.

This makes the task easier