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Velocity of masses on an atwood machine?

  1. Oct 17, 2016 #1
    1. The problem statement, all variables and given/known data
    2 masses m1 and m2 are attached by a string to a massless pulley. mass 1 is on the surface while mass 2 is hanging off. mass 1 experiences a friction force (mu)k. What is the acceleration of the system? What is the velocity of mass 1 in terms of mass 2?

    2. Relevant equations
    KEo+PEo = KEf+PEf

    3. The attempt at a solution
     
  2. jcsd
  3. Oct 17, 2016 #2
    Don't these masses move at the same velocity?
     
  4. Oct 17, 2016 #3

    gneill

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    Staff: Mentor

    This doesn't sound like an Atwood machine, where both masses should be hanging by the string with no surface involved.
    (mu)k is a force? Isn't μk, the coefficient of kinetic friction?
    Do you mean what is the velocity of mass 1 in terms of the velocity of mass 2?

    Well, if the string remains taught then they'll certainly have the same speed. Technically their velocities would be different since they are moving in different directions (velocity is a vector while speed is a scalar).
     
  5. Oct 17, 2016 #4
    I mean a system where one mass is on a horizontal surface with friction and the other is hanging off the edge connected by a string over a pulley. For some reason I was thinking atwoods machine. But yes that is what I mean
     
  6. Oct 17, 2016 #5

    gneill

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    Staff: Mentor

    Okay, that's clear now. So you now know that both masses will move with the same speed. Was that your question?
     
  7. Oct 17, 2016 #6
    Yes, thanks
     
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