Question

10 disadvantages of friction in points

Answer 1

 The main disadvantage of friction is that it produces heat in various parts of machines. In this way     some useful energy is wasted as heat energy.
2. Due to friction we have to exert more power in machines.
3. It opposes the motion. 
4. Due to friction, noise is also produced in machines.
5. Due to friction, engines of automobiles consume more fuel which is a money loss. 
hey I got only 5...
sorry for that..

Answer 2

hey dear your answer is here:-
disadvantages of friction:-
1) the main disadvantage of friction is that it produces heat in various parts of machines.in this way some useful energy is wasted as heat energy.
2) due to friction we have to expert more power in machines.
3) it opposes the motion.
4) due to friction, noise is also produced in machines .
5) due to friction,engines of automobiles consume more fuel which is a money loss.
6) Machine efficiency is decreased: energy input is lost to heat.
7) getting shocked by doorknobs.
8) rug burn.
9) it counteracts movement and so it takes more energy to move, it can cause unwanted heat,and it wears things out like shoes.
10) forest fire are caused due to friction between braches of tress.


hope it helps