Foundation Science Primary 4 Energy

Siti rubbed her palms together quickly and felt that they became warm. Which of the following is the source of heat in this situation?

A The Sun
B Electricity
C Friction
D A candle flame
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Worked Solution

Step 1: Identify the action (rubbing palms). Step [2-9]: Rubbing two surfaces together creates friction. Step [2-9]: Friction converts kinetic energy into heat energy.

Correct answer: Friction

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