Question

Explain with examples the disadvantages of friction.

Answer 1

Friction reduces the relative motion between two objects in contact. It is a disadvantage in many situations. Let us take the example of the mechanical engine used in cars. Friction between the mechanical components of the engine prevents smooth movements. This causes loss of energy in the form of heat, sound, etc. This reduces the efficiency of the car. If the engine is not properly lubricated, excessive friction may even damage its mechanical parts because of excess heat production. The excess sound coming out of the engine is also undesirable.