why friction is a necessary evil
Answers
Friction is necessity:
(1) It is due to friction between the ground and the feet that we are able to walk.
(2) The brakes of a vehicle cannot work without friction.
(3) Various parts of a machine are able to rotate because of friction between belt and pulley.
(4) The tyres of vehicles are made rough to increase friction.
(5) Nails and screws join various wooden parts due to friction.
(6) In the absence of friction it will not be possible to write on paper with a pen or pencil.
Friction is an evil:
(1) Wear and tear of machinery is due to friction.
(2) A large amount of power is wasted in overcoming friction and the efficiency of the machines decrease considerably.
(3) Excessive friction between rotating parts of a machine producers enough heat and causes damage to the machinery.
As friction has both advantages and disadvantages, we can say that friction is a necessary evil.
Answer:hi
Explanation:hi