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Tension problem for ball on string in circle radius - NEED HELP

  1. Apr 17, 2009 #1
    1. The problem statement, all variables and given/known data

    A person whirls a ball and string in a vertical circle of radius 1.50m. The ball travels at a constant speed of 6.50 m/s around the circular path; its mass is 55.0g. What is the tension in the string at (a) the bottom and (b) the top.

    2. Relevant equations

    3. The attempt at a solution

    I was thinking a free body diagram but no idea how to start it. And what would it look like.

    Can anyone give me a good start, or a detailed layout of how you worked the problem.

    Thank you,
  2. jcsd
  3. Apr 17, 2009 #2


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    If it is describing circular motion vertically, what forces are acting on it from gravity and from the string?
  4. Apr 18, 2009 #3
    It would be Ftension pointing upwards, and Mg ( mass x gravity ) pointing downwards. Is that correct?
  5. Apr 18, 2009 #4


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    What is the source of the tension as a result of its circular motion?
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