1. Not finding help here? Sign up for a free 30min 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!

Statics : find coefficient of static friction

  1. Nov 29, 2011 #1
    1. The problem statement, all variables and given/known data
    Find coefficient of static friction if shell starts to slip at θ = 60°

    known - θ
    unknowns - P, r, Normal force, weight

    2. Relevant equations
    friction = μ * normal force


    3. The attempt at a solution
    I do not know where to start. It looks like the picture wants you to assume P is always horizontal so it has no effect on the normal force which means friction is constant. If friction were constant though why would it start to slip?
     

    Attached Files:

  2. jcsd
  3. Nov 30, 2011 #2
    I haven't done this problem but here is a place to start.

    Find the centroid of the shell. The gravitational force will act through the centroid. P is horizontal. Do a free body diagram. Sum forces in X and Y direction. Sum the moments around the contact point. Hopefully everything falls out but Coefficient of static friction which is probably related somehow to the angle.
     
  4. Nov 30, 2011 #3
    Yep, the method I outlined above will give you the correct answer. Treat this as a statics problem.
     
  5. Nov 30, 2011 #4
    ah yes. Your method worked perfectly for me, thank you.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Statics : find coefficient of static friction
  1. Statics- Friction (Replies: 2)

  2. Statics with Friction (Replies: 3)

Loading...