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!

Kinetic friction of box down a ramp

  1. Feb 26, 2005 #1
    A box slides down a ramp inclined at 41 degrees horizonontal with an acceleration of 1.4 m/s^2. The acceleration of gravity is 9.8 m/s^2. Determine the coefficient of kinetic friction between the box and the ramp.

    no ideas need any advice
  2. jcsd
  3. Feb 27, 2005 #2


    User Avatar
    Science Advisor

    {Net Force On Box Parallel To Ramp} = {Gravity Parallel Component} - {Friction} =
    = m*g*sin(41 deg) - K*m*g*cos(41 deg)
    = m*g*{sin(41 deg) - K*cos(41 deg)}
    = m*a

    a = g*{sin(41 deg) - K*cos(41 deg)}
    (1.4) = (9.8){(0.6561) - K*(0.7547)}
    K = {(1.4/9.8) - 0.6561}/(-0.7547)
    K = (0.6801)

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

Similar Discussions: Kinetic friction of box down a ramp