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 Kinetic Friction

  1. Nov 12, 2008 #1
    1. The problem statement, all variables and given/known data
    A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^2. Determine the coefficient of kinetic friction between the box and the ramp.

    2. Relevant equations
    μk=f sub k/Fn

    3. The attempt at a solution

    With the information I have, I have no samples in my physics book or anything. I ohnestly don't know where to start.
  2. jcsd
  3. Nov 12, 2008 #2


    User Avatar
    Gold Member

    I would start by drawing a free body diagram.

    Edit: Fixed spelling
  4. Nov 12, 2008 #3
    Is there a mathematical solution though?
  5. Nov 12, 2008 #4
    What do I need to get to solve this? Do I need mass? Normal force? what?

    k well...i have searched the glossary of my book, searched the internet since 3 pm.
    Last edited: Nov 12, 2008
  6. Nov 12, 2008 #5


    User Avatar
    Gold Member

    Yes there is an analytical solution to the problem. Draw the free body diagram and write out the sum of the forces in both the x and y directions.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook