Standard Science Primary 4 Energy

Jun Jie rubs his hands together quickly on a cold day. Why do his hands feel warmer?

A The Sun is shining on his hands.
B Friction between his hands produces heat.
C Heat is transferred from the cold air.
D His hands are losing heat to each other.
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Worked Solution

Step 1: Rubbing creates friction between surfaces. Step 2: Kinetic energy from the movement is converted into heat energy. Step 3: This makes the skin feel warm.

Correct answer: Friction between his hands produces heat.

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