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Homework Help: Adding a mass on an oscillation causing a change in frequency

  1. Aug 10, 2009 #1
    1. The problem statement, all variables and given/known data
    A thin uniform rod of mass m is suspended from one end and oscillates with a frequency f.
    If a small sphere of mass 2m is attached to the other end, does the frequency increase or decrease?

    2. Relevant equations

    3. The attempt at a solution
    I have reached a conclusion that the frequency would decrease but im not sure exactly why. Is it because the amplitude would become bigger?
  2. jcsd
  3. Aug 10, 2009 #2


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    No, it's not because of the amplitude.

    Is this talking about a pendulum? What do you know about pendulums? Any formulas?
  4. Aug 10, 2009 #3
    i know that pendulums work due to the concervation of energy but i dont understand how this could be about a pendulum.
  5. Aug 10, 2009 #4
    Unless the P.E becomes greater when mass and since P.E=K.E, K.E becomes greater. But i dont understand how this would change the frequency.
  6. Aug 10, 2009 #5


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    What can you say about the period of a pendulum?
  7. Aug 10, 2009 #6
    kavipach: What is the equation for frequency of a pendulum?

    If you look closely, there are only two variables in that equation. Is mass one of them?
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