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Homework Help: Coupled Forced Oscillators- Small Question-

  1. Feb 12, 2004 #1

    I have the infamous triatomic molecule, with two m masses in the extremes and one 2m mass in the middle, joined by two k springs. I have worked all through the problem (found frequencies, normal modes, drawn configurations, initial conditions) with no hindrances, but I can't seem to get the last question.

    It says: If a harmonic force is applied to one of the masses, to which would it be better to excite better the highest frequency mode?

    Btw, the highest freq. mode is w^2= 2k/m and it happens with the first and third masses are in phase, with the middle mass in counterphase (1,-1,1)

    How do I know which mass should I excite?


  2. jcsd
  3. Feb 12, 2004 #2


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    Homework Helper

    You can try both, and then see which one gives better resonance. My intuition tells me that the mass in the middle would be the one. I'm assuming that "better" means "less energy required."
  4. Feb 13, 2004 #3

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