WHY IS FRICTION A NECESSARY EVIL ????
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!!
Friction has advantages and disadvantages.
1.Construction of buildings is possible only because of friction.
2.It because of friction between the paper and the tipo of the pen that we are able to write.
3.Without friction between our shoes and ther ground,we will not be able to walk.
4.We can also change direction in a car because of friction
1.Heat produced in the moving parts of machines causes wear and tear of the parts.
2.A lot of energy is wasted in overcoming friction.
3.Friction causes wear and tear of the soles of shoes.
4.Friction causes the damage of parts of machines and equipments which have to face the force of friction.
Thus friction is a neccessary evil.
Friction is a necessary evil. Without friction, we cannot walk, hold articles, the brakes of automobiles do not work, and the power of a motor cannot be transferred to a grinding machine.
However, friction is undesirable in certain areas and we need to reduce it. Friction between the sliding surfaces of two objects can be reduced by making the surfaces in contact smooth by polishing the surfaces. Sliding friction between the moving parts of vehicles can be reduced by using oil, grease or graphite. In electrical plugs, graphite is used to reduce friction between the plug pins and the corresponding socket. In certain machines, like the drill used by a dentist, a layer of air is used as a lubricant to reduce friction between the moving parts.
friction is said to be a necessary evil because it is useful as well as harmful. friction helps us to walk, write, hold things, lift objects. So it is necessary in our lives. Without friction many essential processes can not be done. On the other hand, it is also unecessary at times. it sometimes results in loss of energy, wear and tear of parts of machinery, due to which it also damages things. so it is an essential evil.
FRICTION PLAYS AVERY IMPORTANT ROLE IN OUR DAILY LIFE.MANY OF OUR DAILY ACTIVITIES DEPENDS ON THE PRESENCE OF FRICTIONAL FORCE.IN SOME CASES FRICTION IS USEFULAND NECESSARY.IN OTHER CASES FRICTION CAUSES A WASTES OF ENERGY AND DAMAGES MOVINGS PARTS OF MACHINERY e.t.cIT IS THEREFORE HARMFUL AND AN EVIL OR NUISANCE IN SUCH SITUATIONS.
friction plays a very fine role in our lives as we cannot tie a knot,fix a nail,construct a building , walk ,write, etc without friction. it is a necessary in this way.
but it worns out the soles of shoes,nails and many more things and also during the force of friction heat is generated which results in loss of energy.