Standard Science Primary 4 Energy

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

A The ball increased in mass.
B The ring became smaller.
C The ball became heavier.
D The ball increased in volume.
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Worked Solution

Step 1: Heating causes solids to gain heat. Step 2: When solids gain heat, they expand. Step 3: Expansion means an increase in volume (taking up more space). Step 4: The larger ball can no longer fit through the same ring.

Correct answer: The ball increased in volume.

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