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Calculate minimum speed of an object in circular motion

  1. Oct 27, 2008 #1
    1. The problem statement, all variables and given/known data

    Picture of my object
    http://img147.imageshack.us/my.php?image=circlekz1.png
    How do i calculate the least amount of speed ( aka vmin) an object has at point z without breaking the string or making it go slack. I also need to show how I got it.

    There should be little to no numbers used. This is mostly variables and in putting vmin on one side and showing how i got there.
    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 27, 2008 #2

    LowlyPion

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    Homework Helper

    Welcome to PF.

    Draw a force diagram and identify what forces at z need to be in balance to satisfy the minimum speed.
     
  4. Oct 27, 2008 #3
    the only 2 forces are t and w but those are going in the same direction, there is no force in an opposing direction!
     
  5. Oct 27, 2008 #4

    LowlyPion

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    Homework Helper

    And what again is the "T"?

    How do you calculate T if it was horizontal?
     
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