Just for clarification for others reading this, there is no correlation between surface area and friction. Amontons' Second Law states "the force of friction is independent of the apparent area of contact." The difference in friction forces in your example comes from the difference in mass, not the difference in surface area.
cadjunkieMember Since 28 Feb 2013
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I'm a mechanical engineer with a computer science minor. I work in the aerospace industry building UAVs. I've been interested in computer graphics since I was 10.
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