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Homework Help: Simple Harmonic Motion

  1. Nov 26, 2012 #1
    1. The problem statement, all variables and given/known data
    I'm doing a lab, and they want me to show the dependance of the period on different variables (displacement, mass, and length of pendulum). They ask me to "Fit curves to your plots to show the dependence. Use the curve fits from your plots to devise an equation for
    determining the period of oscillation for a simple pendulum," and then to "Compare your
    equation to the standard equation for a simple pendulum."

    So my questions are:
    -How do I fit a curve to my graphs (i'm using logger pro), and what information can I get from doing that?
    -What is the equation for the oscillation of a simple pendulum? All i've found is the one for angles smaller than 1 degrees. Thanks!

    2. Relevant equations

    The only equation I have found online is T= 2 pi sqrt (L/g)

    3. The attempt at a solution
  2. jcsd
  3. Nov 26, 2012 #2
    -the differential equation for simple pendulum is ;

    md^2x/dt^2=-mgsinβ if we choose small angle it will simple harmonic motion.

    IF the length of the rope is L , and displacement is x;
    we can write sinβ=x/l

    from our differential equation md^2x/dt^2 = -mgx/l /divide both side to m

    we know that; a = -ω^2(x)

    ω=(g/l)^1/2 from this expression we can say that period is T=2∏(l/g)^1/2

    It's means that you have to try with different size of rope.Simple pendulum depence only size of rope.
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