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Static and Kinetic Friction

  1. Oct 13, 2009 #1
    Hey guys, im having a little brain fart here, any help? Easy stuff

    Im trying to find the static and kinetic friction of an object on a certain surface. We used a modified atwood's machine and got the following results:

    Static mass required: 360g
    Kinetic mass required: 250g

    The mass on the table was 1 kg.

    Can someone help me out? and i would love to see some work also..
     
  2. jcsd
  3. Oct 13, 2009 #2
    Also here is some spitballing i have been doing

    [tex]\Sigma[/tex]Fy=F[tex]_{N}[/tex]-F[tex]_{G}[/tex]=0
    => F[tex]_{N}[/tex]=F[tex]_{G}[/tex]= ma

    I got 9.8m/s[tex]^{2}[/tex]? not sure if thats right
     
  4. Oct 13, 2009 #3

    rl.bhat

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    Can you write down the expression for the frictional force?
     
  5. Oct 13, 2009 #4
    [tex]\mu[/tex][tex]_{s}[/tex]ma

    i believe it is where mu sub s is the static coefficient
     
  6. Oct 13, 2009 #5

    rl.bhat

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    Mass is on the table and weight is hanging. Is it so?
    In the given problem, what is the frictional force? And what is the normal reaction?
     
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