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!

Homework Help: Coefficient of Friction issue

  1. Dec 15, 2015 #1
    1. The problem statement, all variables and given/known data
    I'm having trouble finding the coefficient of kinetic friction for a lab using spring scales.
    Normal Force=4.0278
    Average Pull Force=.46N
    Frictional Force= -.46N

    2. Relevant equations
    μ k = Fk / N.
    3. The attempt at a solution
    μ k = -.46N/4.0278
    μ k = -.1142
  2. jcsd
  3. Dec 15, 2015 #2
    I am not entirely sure what the variable in the last part meant, it may be better if you could use subscripts to distinguish the terms. What I can say is that the coefficient of friction--μ is equal to the quotient of Friction force and normal force. So:

    (Force of friction)/(Normal force) = μ

    Have fun with the lab.
  4. Dec 16, 2015 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    The coefficient of friction isn't going to be negative. That's just due to the direction that you defined as +ve.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted