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Coefficient of friction

  1. Nov 3, 2013 #1
    hello everyone. Can anyone please help with following questions?

    1. Can coefficient of friction (both static and dynamic) be greater than one? What happens if it is greater than 1 ?
    2. Why coefficient of kinetic friction is less than coefficient of static friction and why it decreases at higher velocities?

    Thanking you in advance.:smile:
     
  2. jcsd
  3. Nov 3, 2013 #2

    clem

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    Science Advisor

    1. There is nothing magical about 1 for COF.
    2. Friction is due to temporary welding of the two surfaces, which is less effective as speed increases.
     
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