Explain the advantages and disadvantages of friction .

Explanation

Advantages of friction :
(1) We are able to walk because of friction .
(2) It is impossible for a car to move on a slippery road .
(3) Breaking system of vehicles works with the help of friction .
(4) Friction between roads and tyres provides the necessary external force to a accelerate the car .
(5) Transmission of power to various parts of a machine through belts is possible by friction .
Disadvantages of friction :
(1) In many cases we will try to reduce fric tion because it dissipates energy into heat .
(2) It causes wear and tear to machine parts which cause frequent replacement of machine parts .