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

Dear Student,

Friction as a friend
:

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

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

(iii)
Friction helps in applying the brakes in vehicles.

Friction as a foe:

(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.

(iii)
Due to friction,machine efficency is decreased: energy input is lost to heat.

Regards

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