question_answer

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

Answer:

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.