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Give two examples where friction is (a) Useful (b) A nuisance.

Kindly refer to the following link: 
https://www.meritnation.com/ask-answer/question/what-are-the-advantages-disadvantages-of-friction-how-ca/laws-of-motion/1207885

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Advantages of friction:-

1.Friction helps us in walking.Without friction we would slip as soon as we try to walk.

2.Friction helps us in writing with pen,pencil etc.

Disadvantages of friction:-

1.It makes the machines in the factories or car engines overheated.

2.Friction wears out the soles of our shoes.

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