# Bifilar Pendulum experiment

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Could someone please give me an overview of how I get from measuring the time taken for x oscillations and the distance of the rod, to proving it moves with simple harmonic motion? I know i have to plot t--d^-1 on a graph, then using the gradient (td) i need to do some maths magic to get either an equation linking acceleration to velocity or displacement (to prove the motion is simple harmonic).

the setup is like this http://www.egglescliffe.org.uk/physics/gravitation/bifilar/Image7.gif but i dont understand the rest of the experiment he has done...

thanks :)

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