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!

Friction of rubber box on concrete floor

  1. Feb 15, 2017 #1
    1. The problem statement, all variables and given/known data
    A 10 kg rubber box is resting on a concrete floor. A force of 200 N is then applied to this box in a horizontal direction. What is the magnitude of the friction force on the box?

    2. Relevant equations
    This is a question about applying newton's laws so Fsmax = μs η and η = mg.

    3. The attempt at a solution
    I have had answers -200 N, 98.1N, and 200N in which they are all incorrect. I have an idea it could be 0 N since the net force would have to be 0 since it is at rest and there is a static friction present but I am not sure.
     
  2. jcsd
  3. Feb 15, 2017 #2

    cnh1995

    User Avatar
    Homework Helper

    What is the co-efficient of friction between rubber and concrete? Is that given? If not, I think you should look it up.
     
  4. Feb 15, 2017 #3
    It's 1.00
     
  5. Feb 15, 2017 #4

    cnh1995

    User Avatar
    Homework Helper

    So what's the equation?
     
  6. Feb 17, 2017 #5

    James R

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Is the question asking about the friction force before it starts sliding, or after (assuming it slides)?
     
  7. Feb 17, 2017 #6

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Given the coefficient of friction, it is safe to assume it slides.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted