Standard Science Primary 4 Energy

A metal ball could just pass through a ring. After heating the ball for 5 minutes, it could no longer pass through. Why?

A The ball gained heat and expanded.
B The ball lost heat and contracted.
C The ring gained heat and contracted.
D The ball gained mass and became heavier.
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Worked Solution

Step 1: Heating a solid causes its particles to move more and take up more space. Step 2: This increase in volume is called expansion. Step 3: The expanded ball is now larger than the ring.

Correct answer: The ball gained heat and expanded.

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