Q9. Give examples to show that friction is both a friend and a foe.

Answers (1)

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.

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