defination of friction is necessary evil
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Friction is a necessary evil because it has some pros but cons also:
PROS:
1-Friction is the force which helps us walk ,it is Friction which helps us to make grip over the ground
2-cars and buses are able to move safely on road because friction between road and the tyres
CONS:
1-Friction causes wastage of energy.This is because any object that moveshe has to overcome Friction
2-Friction wears out rubbing surfaces,The soles of your shoes
wear out after some time
3-Friction generates heat which can be harmful sometimes. The heat in a fast moving machine is very high,proper arrangements shoutdoor be made to cool down the machine or it will get damaged
PROS:
1-Friction is the force which helps us walk ,it is Friction which helps us to make grip over the ground
2-cars and buses are able to move safely on road because friction between road and the tyres
CONS:
1-Friction causes wastage of energy.This is because any object that moveshe has to overcome Friction
2-Friction wears out rubbing surfaces,The soles of your shoes
wear out after some time
3-Friction generates heat which can be harmful sometimes. The heat in a fast moving machine is very high,proper arrangements shoutdoor be made to cool down the machine or it will get damaged
portblair:
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Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .
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