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Hi, I am investigating damped harmonic oscillations using my smartphone to record the motion of the phone as a swinging pendulum.

Is there any uncertainty related with running the acceleration (without g) sensor?

Also, I notice that there are small wavelets formed when you look at the graphs of linear acceleration in the x and z direction, but not the y direction. Why is this?

Hi Nate,

please check out Solid's post,, and the reference therein. That perhaps answers some of your questions and shows an alternative setup idea.

Are you analyzing a mathematical or a physical pendulum? Could there be an overlaying rotation so that your smartphone's x-axis does not permanently correspond to the pendulum direction?