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 takes place expands first, then on cooling contracts and fits onto the wooden wheel.
ScienceClass 6CBSEAnswered 27 Mar 2026
Answer
- Solution:
- : expands first, then on cooling contracts and fits onto the wooden
Iron expands on heating. So the smaller iron rim expands on heating fits into the wooden wheel and on cooling it contracts to fit into the wooden wheel tightly. Hence it does not
come out.