Which out of these is both an advantage as well as a disadvantage?

  1. Produces heat
  2. Causes moving objects to stop
  3. Stopping vehicles
  4. All of the above


Production of heat and stopping a moving object are some effects of friction that are both advantageous and disadvantageous.

The correct answer is: All of the above

    • The effects of friction involve heating, stopping a moving object, and stopping vehicles.
    • All these are advantageous in certain cases and disadvantageous in certain cases.
    • The effect of friction depends on what way it is being used, for example heat produced during the working of a machine due to friction is disadvantageous but the same heat produced due to rubbing of hands on a cold day is advantageous.