Standard Science Primary 4 Energy

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

A To allow the tracks to expand on hot days without buckling.
B To save metal when building the tracks.
C To allow water to drain away when it rains.
D To allow the trains to move faster.
Show Worked Solution

Worked Solution

Step 1: Metal expands when it gains heat from the sun. Step 2: If there were no gaps, the expanding tracks would push against each other and buckle or bend. Step 3: The gaps provide space for this expansion.

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

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