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Homework Help: Forced Oscillations

  1. Nov 13, 2008 #1
    1. The problem statement, all variables and given/known data
    A 2.00 kg object attached to a spring moves without friction and is driven
    by an external force F=(3.00N) sin(2pie t). Assuming that the force
    constant of the spring is 20.0 N/m determine (a) the period and
    (b) the amplitude of the motion.

    2. Relevant equations
    T = 2pi sqrrt(m/k)
    A = (Fo/m)/sqrrt (w^2 - wsubO)^2

    3. The attempt at a solution
    T = 1.99s
    A = ?

    I don't think that either equation is right. The answers are in
    the book but these aren't working.
  2. jcsd
  3. Nov 14, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    There are 2 periods, or frequencies, of relevance here: the natural frequency, and the driving-force frequency.

    If your calculated period is wrong, perhaps you need to think about the other period that is relevant.
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