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OK - Tomorrow night when my daughter (IBApril180 on this board) is over we will post the results of her science experiment here, which I must admit surprised me. Using Brecoflex belts and FIRST spec carpet, the traction increased by DECREASING the amount of contact area! This appeared to be because the impact of additional deformation of the carpet due to higher local pressure was a higher order effect than the additional quantity of "nubs" interacting with the carpet. It threw our F = mu*N + nu*A hypothesis out the window. Stay tuned.
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That can't be right. The formula isn't right but there some correlation between surface area and traction. Ahhh I see if you have two objects with the same pressures the one with more surface area will have greater traction than the one that doesn't. Which is why tank treads work and you need the bogies in the treads so that there is pressure on the track all the way through.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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