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Homework Help: Find the velocity given coefficient of friction and radius?

  1. Feb 21, 2017 #1
    1. The problem statement, all variables and given/known data
    An disk has a radius of 0.2 meters. A lump of putty with a coefficient of static friction of 0.9 is stuck on the edge of the disk.

    Let's say the disk starts at rest and gradually speeds up. At what speed will the putty just barely be able to stay in place on the edge of the disk?

    2. Relevant equations

    3. The attempt at a solution

    I'm a bit stuck as to where I should start with this.
  2. jcsd
  3. Feb 21, 2017 #2


    User Avatar

    Staff: Mentor

    Hi Kataryx,
    Welcome to Physics Forums!

    You need to show some work before help can be offered. Did you draw a free body diagram for the putty? What forces are acting?
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