Standard Science Primary 6 Interactions

Which of the following is an example where friction is NOT useful?

A Treads on the soles of shoes
B Using a towel to dry wet hands
C Applying brakes to stop a bicycle
D Heat produced in a moving car engine
Show Worked Solution

Worked Solution

Step 1: Friction opposes motion and often produces heat. Step [2-9]: In an engine, friction causes wear and tear and produces unwanted heat energy. Step [2-9]: This wasted energy reduces efficiency, making friction unhelpful here.

Correct answer: Heat produced in a moving car engine

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