Standard Science Primary 4 Energy

Why are there gaps left between the sections of metal railway tracks?

A To save on the cost of metal.
B To make the train ride bumpier for safety.
C To allow rainwater to drain away.
D To allow the tracks to expand on hot days without buckling.
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Worked Solution

Step 1: Metal tracks gain heat from the sun. Step [2-9]: Heat gain causes the metal to expand. Step [2-9]: Gaps provide space for this expansion so the tracks do not push against each other and bend.

Correct answer: To allow the tracks to expand on hot days without buckling.

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