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