1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook