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Minimum speed at the circular track

  1. Oct 24, 2010 #1
    1. The problem statement, all variables and given/known data

    What is the minimum speed of the car must have at the top of the loop? There are three methods. I would like to know which method or answer is correct.

    Please see attached file.

    2. Relevant equations

    Please see attached file.


    3. The attempt at a solution

    Please see attached file.
     
  2. jcsd
  3. Oct 24, 2010 #2

    rock.freak667

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    I would choose the third one,provided that H> 2r.
     
  4. Oct 25, 2010 #3
    Thanks a lot. Why didn't consider the force at the top?
     
  5. Oct 25, 2010 #4

    rock.freak667

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    Homework Helper

    I think if H> 2r, then the speed will be enough to provide the centripetal force.
     
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