Examples of friction that usefull and harmfull
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usefull:-1. helps to walk
2.helps to write
3.helps in burning matchstick
harmfull:-1. consumes precious sources of energy.
2. responsible for lot of wear and tear.
Hope it helps you
2.helps to write
3.helps in burning matchstick
harmfull:-1. consumes precious sources of energy.
2. responsible for lot of wear and tear.
Hope it helps you
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