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Are coefficients of friction invariant by switching the materials ?

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I don't have the ability to make the experiment to answer these questions :

Let $A$ and $B$ be two materials. Is the static coefficient of friction of $A$ on $B$ equal to the static coefficient of friction of $B$ on $A$ ? I ask the same question for the sliding coefficient of friction.

Thank you in advance for any help you can provide.

Closed as per community consensus as the post is not graduate-level and above (and also completely trivial). PhysicsForums.com might be a better home for this question.

asked Jul 2, 2015 in Closed Questions by Gaussian (-10 points) [ no revision ]
recategorized Jul 3, 2015 by dimension10

Voting to close as not graduate-level physics (and besides, pathetically trivial). The question seems more appropriate for Physics Forums.

commented Jul 3, 2015 by dimension10 (1,985 points) [ revision history ]

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