How does sand paper help in increasing friction?
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The more contact area the higher the friction. ... As the sandpaper got to a certain roughness the grains of sand where larger which decreased the over all contact area and reduced the friction. The grains are larger so there will be fewer contact points.
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Answer: A smooth surface can be made rough with the help of sandpaper. There are more irregularities on a rough surface than on a smooth surface. Thus, sand paper helps in increasing friction; by increasing the roughness of a surface. ... Thus, friction is beneficial as well as harmful.
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