42. Which of the following is false?
(a) Friction opposes motion
O (b) Friction is caused by irregularities on surfaces of objects.
ООО
(c) Friction is always disadvantageous
(d) Friction is a contact force.
43. Aeroplanes are given streamlined shape to
O .
(a) Minimise static friction.
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Answer:
Option C, Friction is always disadvantageous.
True Ans. Friction is not always disadvantageous.
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