Question 9

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


Advantages of friction are as follows:

  1. We are able to walk.
  2. We can write.
  3. Friction is used to stop the vehicle.
  4. It produces heat.
  5. Helps in different types of motion.

Disadvantages of friction are as follows:

  1. Forest fires occurs due to friction between branches of trees.
  2. It is an opposing force, so energy is needed to overcome it.
  3. Tyres and soles of shoes tears out.
  4. Damage machines.
  5. It produces a lot of heat.

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