Question

state two advantages and two disadvantages of friction

Answer 1

Advantages 1.friction helps us to walk.When we press the ground with our foot backward,we receive a forward reaction due to friction between our foot and the ground.Had there been no friction the foot will simply slip away. 2.friction hepls ue to write on the backboard or on a paper. 3.Brakes make use of friction to stop vehicles. 4.friction helps to transmit power from the motors and engine to other machines by making use of belts and clutches. disadvantages : 1.friction cause unnecessary wear and tear of the machinery. 2.Due to friction between the moving parts of a machine heat is produced,which in a wat affects the working as well as the life of a machine. 3.A part of useful energy is dissipated in overcoming the friction.

Answer 2

Advantages

Friction helps in applying the brakes.It helps in walking on floor.

Disadvantages 

Due to friction we have to exert more power in machines.It opposes the motion.