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!

Experimentally Determine Coefficient of Static Friction

  1. Oct 16, 2007 #1
    I need to determine the coefficient of static friction for the following set-up.

    M1 = 380.45g
    M2 = 74.7g

    This is what I know... u=F/mg

    What I can't figure out is how to factor in the horizontal and vertical weights.

    Can anyone help?

    Thanks!
     

    Attached Files:

  2. jcsd
  3. Oct 16, 2007 #2
    I should clarify.. those weights are the weights where the system just begins to move.
     
  4. Oct 16, 2007 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: What does the tension in the string equal?
     
  5. Oct 16, 2007 #4
    OK, the tension for both is the same.. and it is equal to.... M2g I think ?

    I'll keep thinking on this..

    Thanks
     
  6. Oct 16, 2007 #5

    Doc Al

    User Avatar

    Staff: Mentor

    Right. There's a single tension in the string and it equals [itex]M_2g[/itex].

    So, what must the friction force equal?
     
  7. Oct 16, 2007 #6
    OK, here's what I think... the force must equal the tension (M2g), which is equal to uN.

    What is N then? The mass of M1??
     
  8. Oct 16, 2007 #7

    Doc Al

    User Avatar

    Staff: Mentor

    Good!

    Not the mass but the weight of M1.
     
  9. Oct 16, 2007 #8
    Yes, the weight!

    Thanks a bunch for your help!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?