WHY IS FRICTION A NECESSARY EVIL ????
Dear Student!!
You are able to walk because of friction. If there had not been friction, you would have slipped all way, and you won’t be able to stop anywhere. Some of the very basic activities are possible only because of friction.
At the same time, it is friction which causes wear and tear to our machines. Moreover we need to apply a huge amount of energy to overcome friction in various parts of machine.
Considering all these factors friction can be called a necessary evil!!