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How can you say that friction is a necessary evil?
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.
What is bad about friction?
Friction manifests as heat energy generally and sometimes as noise. When objects are moving against each other, there is a generation of kinetic energy. Friction causes this kinetic energy to change into thermal energy. ... The biggest disadvantage of friction is wear and tear that happens as a result of friction.
Is friction good or evil Explain with examples?
In some cases, friction is useful to us. But, on the other hand, it is also a necessary evil. ... (i) Friction between our feet and the ground helps us to walk on the ground without slipping or falling. (ii) Due to greater friction, the tyres get a better grip on the road which prevents skidding of the vehicles.
Where is friction used in everyday life?
Friction can be useful. For example: friction between our shoes and the floor stop us from slipping. friction between tyres and the road stop cars from skidding.
Where is friction not useful?
Friction is sometimes unhelpful.
For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases. Your bike will be noisy and difficult to pedal. When there is a lot of friction between moving parts, energy is lost to the surroundings as heat.
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