Question

Explain the causes of changes.

A blacksmith heat the iron rim before fitting it on wooden wheel.Explain.

​

Answer 1

Answer:-

The iron ring to be put on the rim of a cart wheel is always of slightly smaller diameter than that of the wheel. When the iron ring is heated to become red hot, it expands and slips on to the wheel easily. When it is cooled, it contracts and grips the wheel firmly.

Answer 2

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. 

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