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advantages and disadvantages of friction, kindly give me two examples for each

Friction is a necessity (Advantages of Friction):

(i) It is due to friction between ground and the feet that we are able to walk.
(ii)The brakes of the vehicle cannot work without friction.
(iii)Various parts of a machine are able to rotate because of friction between belt and pulley.
(iv) The tyres of vehicle are made rough to increase friction.
(v) Nails and screws join various wooden parts due to friction.
(vi) In the absence of friction,it will not be possible to write on a paper with a pen or pencil.

Friction is an evil (Disadvantage of Friction)

(i) Wear and  tear of the machinery is due to friciton.
(ii) A large amount of power is wasted in overcoming friction and the efficiency of the machines decreases considerably.
(iii) Excessive friction between rotating parts of a machine produces enough heat and causes damage to the machinery.

 As friction has both advantages and disadvantages,we can say that friction is  a necessary evil.


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