Question

Explain how a metal to is fixed around the wooden wheel of a cart.

Answer 1

Heya mate...

The metal rim gets heated to fix it on to a cart because metal rims are made slightly smaller. On heating, the rim expands and fits on to the wheel. Then on cooling, the rim contracts and fits slightly on to the wheel. It is a physical process.

Answer 2

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Metals expand on heating and contract on cooling. This expansion and contraction of a metal is a reversible change. The metallic rim used is slightly smaller in diameter than the wheels .On heating the rim expands. And can easily lie on the wheels. When the rim cools, it contract and press tightly on to the wheels.