Standard Science Primary 4 Energy

Why are there small gaps left between the metal rails on a train track?

A To save on the cost of metal.
B To help the train slow down.
C To allow water to drain away.
D To allow the rails to expand on hot days.
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Worked Solution

Step 1: Metals gain heat and expand (increase in size) in hot weather. Step 2: Without gaps, the rails would buckle or bend. Step 3: Gaps provide space for expansion.

Correct answer: To allow the rails to expand on hot days.

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