Notices
Results 1 to 4 of 4

Thread: Static Friction

  1. #1 Static Friction 
    Junior Member
    Join Date
    Mar 2014
    Posts
    1
    The question is, What is the largest angle from the up-right position can a chair lean with mass m with out sliding out and falling? The coefficient of static friction is Mu s. In other words, at what angle with the static friction become kinetic friction.
    Reply With Quote  
     

  2. #2  
    Senior Member
    Join Date
    Feb 2014
    Location
    New Zealand
    Posts
    203
    Quote Originally Posted by phys91 View Post
    The question is, What is the largest angle from the up-right position can a chair lean with mass m with out sliding out and falling? The coefficient of static friction is Mu s. In other words, at what angle with the static friction become kinetic friction.
    Just leaning my pen over to the point where it slides along my desk, there is an angle, but there are lesser angles from the vertical where the pen slides if there is an additional downward force. So I'm tending to think that the mass on the chair will have a bearing on it too.
    Last edited by Robittybob1; 03-26-2014 at 02:40 AM.
    Reply With Quote  
     

  3. #3  
    Senior Member
    Join Date
    Jan 2014
    Location
    out there
    Posts
    306
    The coefficient of static friction is equal to the tangent of the maximum angle of an inclined plane at which the object starts to slide.
    The coefficient of kinetic friction is equal to the tangent of the angle of an inclined plane when the object is sliding at constant velocity.

    Those angles are the arctans of coefficients.


    The coefficient of static friction is greater than of kinetic friction. The angle is of couse greater also..
    Reply With Quote  
     

  4. #4  
    Senior Member
    Join Date
    Feb 2014
    Location
    New Zealand
    Posts
    203
    by gollie that was interesting.
    "Physics: Inclined Planes: Proving Coefficient of Friction = Tan Theta"
    Physics: Inclined Planes: Proving Coefficient of Friction = Tan Theta - YouTube
    Reply With Quote  
     

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •