Standard Science Primary 4 Energy

A metal ball could just pass through a metal ring. After heating the ball over a flame for two minutes, it could no longer pass through the ring. Why?

A The ball changed its state.
B The ball gained mass.
C The ball expanded in volume.
D The ring contracted.
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Worked Solution

Step 1: Heating a solid causes its particles to move further apart. Step 2: This results in an increase in volume (expansion). Step 3: The ball became larger and could no longer fit through the same-sized ring.

Correct answer: The ball expanded in volume.

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