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!

Find the acceleration : block slides on a wedge

  1. Oct 21, 2012 #1
    sry for typo..it should be acceleration
    1. The problem statement, all variables and given/known data

    A block m slides down from a frictionless inclined surface (theta = 45) of a wedge, mass m, which is on a horizontal plane with coefficient of friction u. Prove that the wedge moves to the right with acceleration equal to g(1-3u)/(3-u) .

    im stuck on this question for a whole week..but still cant get the answer
    not sure if it is a question related to relative motion?
    plz help!!
    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Oct 21, 2012
  2. jcsd
  3. Oct 21, 2012 #2

    Ibix

    User Avatar
    Science Advisor

    As always, draw a force diagram.

    If what you want is the acceleration of the wedge, you need to know the net force on the wedge. If you can't figure it out, post your working, and a photo of your diagram if possible.
     
  4. Oct 21, 2012 #3
    f21618phyd223.png

    cant get the relation of these three accelerations..
     
  5. Oct 21, 2012 #4

    Ibix

    User Avatar
    Science Advisor

    You have three equations in four unknowns - you just need one more. You just need to enforce that the block stays on the wedge and doesn't go flying off - kinematic equations may help.

    One minor point - your ay has the same sign as g, but you have defined +y to be up the page. It doesn't affect your maths here, but it can do in general.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find the acceleration : block slides on a wedge
Loading...