whose coefficient of friction will more used sandpaper or unused sandpaper? and why
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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. This explains your sisters results. 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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Answer
It it is the area of all the microscopic contact points between the two objects. The more contact area the higher the friction. This explains your sisters results. 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.
please mark my answer as brainlist
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