Question

Question 9
Give various examples to show that friction is both a friend and a foe.

Answer 1

Friction as a friend:
$\to$ We are able to walk because of friction.
$\to$ Friction between the tip of the pen and a paper allows us to write.

Friction as a foe:
$\to$ Tyres and soles of shoes wear out because of friction.
$\to$ Friction between the different parts of machines produces heat. This can damage the machines.