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Question

Science Question on Force of Friction

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

Answer

Friction is both a friend and a foe due to following reasons:

Friction act as 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 wall surfaces because of friction.
  • Lighting a match stick is because of friction between match stick and the side surface of match box.

Friction act as 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 road surface.
  • Machines gets heated up because of friction.
  • Due to friction, machines and vehicles consumes more fuel and increase maintenance cost.