Question

why does the iron rim to be mounted on a wooden cart wheel have a slightly smaller diameter than the wooden wheel​

Answer 1

Answer:

The diameter of an iron tyre is kept slightly smaller than the wooden wheels. Because on heating, it expands and fit over the wooden wheels.

Explanation:

The iron rim is smaller than the wooden wheel. The iron rim is heated so that it expand. When its size becomes larger than wooden wheel it is slipped on the wheel. After that cold water is poured on the wheel so that on cooling the rim contracts and holds the wooden wheel tightlr.

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Answer 2

Answer:

For fixing the metal rim on a wooden wheel of a cart, the metal rim is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim, which contracts and fits tightly onto the wheel.