Question

Give examples to show that friction is both a friend and a foe.
[4 marks]

Answer 1

Advantages of the friction (friction as a friend):

a) We can walk only due to frictional force between our shoes and ground. [1 mark]

b) We are able to write because of the friction between the tip of the pen and paper. [1 mark]

Disadvantages of friction (friction as a foe):

a) Because of friction, the tires and soles of shoes wear out. [1 mark]

b) Friction produces heat between different parts of the machines. This reduces the performance of machines. [1 mark]