Smother the surface have---friction where as rough surface have ----frictin force
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friction occurs because no surface is perfectly smooth
rougher surface have more friction between them.
heavier objects have more friction because they press together with greater force.
friction produces heat energy because it causes the molecules on rubbing surfaces to move faster and have more energy
rougher surface have more friction between them.
heavier objects have more friction because they press together with greater force.
friction produces heat energy because it causes the molecules on rubbing surfaces to move faster and have more energy
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