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Thread: Free Undamped/Damped Motion

  1. #1
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    Free Undamped/Damped Motion

    Would someone please look over my work for (a-h) and help me with (i and j). I am not sure where to start with these two. Thank you!
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  2. #2
    Junior Member Cervesa's Avatar
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    Re: Free Undamped/Damped Motion

    $x(t) = A\sin(\omega t + \phi)$
    $v(t) = A\omega \cos(\omega t + \phi)$

    $x(0) = -\sqrt{3}$, $v(0) = 3$, $\omega = \sqrt{\dfrac{k}{m}} = \sqrt{\dfrac{9}{1}} = 3$, $\phi = -\dfrac{\pi}{3}$

    using the above information gives

    $x(t) = 2\sin \left(3 t - \dfrac{\pi}{3} \right)$
    $v(t) = 6\cos \left(3 t - \dfrac{\pi}{3}\right)$

    passing through equilibrium, $x(t) = 0 \implies 3t - \dfrac{\pi}{3} = \{0, \pi, 2\pi, ... \} \implies t = \bigg\{ \dfrac{\pi}{9}, \dfrac{4\pi}{9}, \dfrac{7\pi}{9}, ... \bigg \}$

    the {1st, 3rd, 5th, ...} passes through equilibrium are in the upward direction

    (h) set $x(t) = -1$ and solve for time

    (i) use solutions from (h) and evaluate if v(t) > 0

    (j) use solutions from (h) and evaluate if v(t) < 0
    Thanks from AmyA
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