Question

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

Answer 1

useful:-
1: it helps us to walk .
2: it helps us to run a vehicle .
harmful :-
1: it damages the shoe soles .
2: it damages the machinery parts of any machine  .
          i hope it helps..............................^_^ 

Answer 2

friction is the force which stops or slow down a moving objects. its usefulness and nuisance are are:-
ADVANTAGES:-
1.friction enables us to write
2.it enable the movement of vehicles and humans
3.it prevents slipping or sliding
4.when we rub our palm, it produces heat due to friction which help to keep us warm
5. we can light matchsticks due to it
DISADVANTAGES:-
1.parts of machines wear out due to friction
2.soles of shoes and slippers wear out due to it
3.sometimes noise is produced due to it
4.it causes heat and energy loss due to it
!!!!hope it helped,,,,please mark as brainliest!!!!!