Why does sandpaper produce a lot of friction?
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7
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It it is the area of all the microscopic contact points between the two objects. 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.
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3
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because it has too much barriers and rough and small things which makes object to Be less frictionous.and create barriers
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