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Energy lost to friction

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bajoneswadup

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I thought the energy lost to friction = (uk)(normal force), but it's actually (normal force)(distance).

Can somebody explain the difference between these two? Am I mixing up static friction and kinetic friction?
 

syoung

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you wrote the first part wrong
it's friction force = uk(normal force)
and energy lost due to friction is = uk(normal force)(distance)
 
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