Standard Science Primary 4 Energy

Why are there small gaps left between railway tracks?

A To let water drain through.
B To help the train slow down.
C To save material.
D To allow for expansion on hot days.
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Worked Solution

Step 1: Metal tracks gain heat from the sun. Step 2: Materials expand when they gain heat. Step 3: Gaps prevent the tracks from buckling/bending when they expand.

Correct answer: To allow for expansion on hot days.

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