friction can be reduced by polishing a surface .explain
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Explanation:
Surface roughness can affect friction in many ways. The amount of ‘real surface’ in contact is a function of the interacting surfaces. Given the same load, more rough surfaces have larger asperities and can dramatically increase the static friction coefficient. In a dynamic friction situation and if lubricated hydrodynamic lubrication theories are at play and the lubricant film thickness can be improved/increased with rough features (eg. Engine Cylinders).
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Friction can be reduced by polishing the surfaces which come in contact moderately and it is called polishing .
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