Knockout NEET July 2020
An exhaustive E-learning program for the complete preparation of NEET..
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Friction acting as a friend:
(a) It aids us to walk and cars to move on the roads.
(b)Fire can be ignited using friction.
Friction acting as a foe:
(a) It causes the efficiency of engines to decrease and also damages machinery.
(b) Friction causes soles of shoes and tires to wear off.