4. Why is the iron ring heated before fitting it over a wooden wheel of a bullock cart?
Answers
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:
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.
OR
The metal rims to be put on a cart wheel is designed to have a smaller diameter than that of the wheel. When this rim is heated, it becomes 'red hot', expands and slips on the wheel easily. When it is cooled in contact and grips the wheel firmly.
Explanation:
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