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 mass.
B The metal ball became heavier.
C The ball expanded and its volume increased.
D The ring became smaller.
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Worked Solution

Step 1: Heating causes solid particles to vibrate more and take up more space. Step 2: This process is called expansion. Step 3: The increase in volume prevents it from fitting through the ring.

Correct answer: The ball expanded and its volume increased.

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