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How to control velocity in a conical pendulum

  1. Apr 8, 2015 #1

    May

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    1. The problem statement, all variables and given/known data
    I'm doing an EPI on horizontal circular motion and for one test the independent variable is mass and I need to control the velocity by using the 2πr/T formula. So I know how to use the forumula to find an unknown but how do I use it for two unknowns (r and T). Is there a forumula with M in it that would help?. Because the r will be different for the different masses and so will the T. I'm really confusing myself now, but I guess my question is how do I control velocity in the experiment.

    IV: mass, length of string
    CV: velocity ....
    DV: angle

    P.S I'll be spinning it by hand and don't have access to a velocity measuring device (unless its an app or something)

    Am I missing the point completely?

    Thanks for any help you can give
     
  2. jcsd
  3. Apr 9, 2015 #2

    Simon Bridge

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    You use ##v=2\pi r/T## to find the velocity, not control it.
    You can find r using some trigonometry and you measure T with a stopwatch.
     
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