Question

why dose a black smith heats a metal rim to fix it in a wheel of a cart? Is heating important? He can fix it directly but what would be difficulties that he may face?​

Answer 1

A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.