
#1
Apr804, 12:06 PM

P: 2

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 td^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/physi...lar/Image7.gif but i dont understand the rest of the experiment he has done... thanks :) 



#2
Apr1004, 10:20 AM

P: 2

please... ?




#3
Apr1204, 10:38 AM

P: 117

I think you could try to compute the potential energy as a function of the angular displacement. You simply (...well, I didn't try it, I don't know how simple it is) have to find the height of the center of mass with a bit of trigonometry.
If the energy is quadratic in phi (or nearly quadratic for small phi), the motion is harmonic (anyone correct me if I'm wrong). 


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