Question

give example to show that friction is both a friend or foe​

Answer 1

Answer:

Friction is a necessary evil acting both as a friend and a foe.

Examples of friction as a friend:

We are able to walk because of frictional forces between ground and our feet.

We are able to write because of friction between ball point and the paper surface.

nails and screws stick to the wall surfaces because of friction.

Lighting a match stick is because of friction between match stick and the side surface of the match box.

Examples of friction as a foe:

Wear and tear of soles of our shoes is due to friction.

When a tyre deflates, it is difficult to move the vehicle because of increased friction between the tyre and the road surface.

Machines get heated up and produce noise because of friction.

Due to friction, machines and vehicles consume more fuel and increase maintenance cost.