Standard Science Primary 4 Energy

Why are there small gaps left between the metal tracks of a railway line?

A To save metal during construction.
B To allow the tracks to expand on hot days without buckling.
C To allow water to drain away during rain.
D To make the train move faster.
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Worked Solution

Step 1: Metal expands when it gains heat. Step 2: On a hot day, the tracks will increase in length. Step 3: The gaps provide space for this expansion so the tracks stay straight.

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

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