Explain any 3 examples where we have to reduce friction
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Friction is a necessary evil which causes a lot of wear and tear in machine parts that move against each other. It erodes the surfaces and destroys their symmetries. Hence, in such cases it is desirable to reduce friction.
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by using lubricants like powder , ball bearings , grease for machines which can enter in into the pores of matter and reduce the friction
another way is best way and that is polishing surface
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