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: Help with question on forces with motion, tension, friction

  1. Oct 1, 2008 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    The equations and the problem, along with the attempt at a solution are shown in the picture above

    3. The attempt at a solution

    The attempt is in the picture as well. Thanks guys for looking at it and helping out in advance. I have no idea with these sorts of problems where to start or what im doing wrong.
  2. jcsd
  3. Oct 1, 2008 #2


    User Avatar
    Homework Helper

    Welcome to PF.
    What are you given for the coefficient of friction?
  4. Oct 1, 2008 #3
    Thanks, its good to be here. Unfortunately all i am given is what is shown in the picture. I just assumed there was friction since it didn't say there wasn't.... thats why its in my equations.
  5. Oct 1, 2008 #4


    User Avatar
    Homework Helper

    Your equations are inaccurate. The tension must allow for the weight of both box and sled as the sinθ from the incline.

    There should be a μ*m*g*cosθ between the box and the sled. When acceleration of the combined system exceeds that then it will slip. But not knowing that μ ... if it was frictionless on the sled it would slide with any tension on the rope.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook