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Yup and it is possible to get coefficents of friction higher than 1. I think rubber is one material where this is possible. It has something to with the chemistry of rubber and the way it deforms.
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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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