Why does the iron rim to be mounted on a wooden cartwheel have a slightly smaller diameter than the wooden wheel?

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Solution

The iron rims will undergo thermal expansion in the summer season.
Thermal expansion is the expansion happening in substances when heated.
If the iron rims are expanding, then they will get loosened from the wooden wheel.
To avoid this kind of situation iron rims are mounted to the wooden wheel in a way that iron rims are having lesser diameter than the wheel to hold them tightly after expansion also.

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Question 7

Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim
(a) expands and fits onto the wooden wheel
(b) contracts and fits onto the wooden wheel
(c) no change in the size take place
(d) expands first, then on cooling contracts and fits onto the wooden wheel

The iron rim to be mounted on a wooden cartwheel has a slightly smaller diameter than the wooden wheel.

Q. Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim:

The iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim

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