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

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.