Give examples to show that friction is both a friend and a foe.

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Solution

Advantages of friction:

(i) We are able to walk because of friction.

(ii) Friction between the tip of the pen and a paper allows us to write.

Disadvantages of friction:

(i) Tyres and soles of shoes wear out because of friction.

(ii) Friction between the different parts of machines produces heat. This can damage the machines.

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