FRICTION IS A NECESSARY EVIL . EXPLAIN
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Friction is a necessary evil:
Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction.
Hence it is considered as a necessary evil .
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friction is necessary :-
1:- it's help us to walk on the ground .
2:-The break of vehicle cont 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.
fraction is 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.
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