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Compound/Physical Pendulum

  1. Mar 10, 2008 #1
    Find the acceleration due to gravity using a compound/phyiscal pendulum. Using the formula: T=2pie*sqrt(I/mgh)

    I understand how to find all the variables but to find g, i must plot a graph of T against something (Thats where i need help) and use the gradient of the line to calculate g.

    so.

    1.What do i plot against T
    2.How would i calculate g from the gradient of the line

    Thanks.
     
  2. jcsd
  3. Mar 10, 2008 #2

    Hootenanny

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    Hi Pete and welcome to PF,

    Firstly, what is the general equation of a straight line?
     
  4. Mar 11, 2008 #3
    Hi,

    The equation of a staright line is y=mx+c, and i guess that T would be the y axis/ the y part of the equation. Would the x axis of the graph be I, because thats the variable I am changing by moving the mass along the rod?

    Once I know the x and y part of the equation would it just be a case of rearanging the origional formula into y=mx+c?

    Thanks
     
    Last edited: Mar 11, 2008
  5. Mar 11, 2008 #4

    Hootenanny

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    Absolutely spot on :approve:
     
  6. Mar 11, 2008 #5
    Thanks alot
     
  7. Mar 11, 2008 #6

    Hootenanny

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    No problem, I didn't do anything...:uhh:
     
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