Standard Science Primary 4 Energy

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

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

Step 1: Metals are solids that expand when they gain heat. Step 2: On hot days, tracks gain heat from the sun. Step 3: The gaps provide space for this expansion to occur safely.

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

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