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Homework Help: Turntable ?

  1. Jun 30, 2008 #1
    Turntable ??

    1. The problem statement, all variables and given/known data
    A block of mass M is place a Distance R from the center of a turntable rotating at W radians/sec.
    A. If the turntable is a frictionless surface, explain the motion of the block.
    B. If the turntable has coefficient of static Friction Us and the block is ready to begin slipping when the turntable is rotating with W radians/sec, find an expression for Us in terms W, R, and g.

    2. Relevant equations

    3. The attempt at a solution
    What is it talking about explain the motion of block? and I don't even know where to begin with the second part because I don't understand the first. I know the block will begin to slide and eventually fall off the turntable. But I'm not sure what its asking for.
  2. jcsd
  3. Jun 30, 2008 #2


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    Gold Member

    Re: Turntable ??

    For part A, when it asks you to explain the motion of the block, id think that it wants you to describe how the block moves (does it go around with the table? Does it move off in some other direction?) and explain why this motion happens.
  4. Jun 30, 2008 #3
    Re: Turntable ??

    It would move closer and closer to the edge of the turntable with each rotation. I understand that, however, I know that's not going to be the right answer unfortunately.
  5. Jun 30, 2008 #4

    D H

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    Staff Emeritus
    Science Advisor

    Re: Turntable ??

    For part (A), what force makes the block move?

    You haven't done anything yet for part B. In particular, what are the relevant equations? We put those things in the template so you would use them.
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