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# Simple Pendulum Watch

1. Hi, How can I prove that a pendulum follows SHM? I have data from an experiment and the angle used is 20 degreesBefore using the T = 2pi*SqRoot(L/g) I want to say the Pendulum follows SHM Could someone help me about how I can prove it pleaseeeeeeeeeeeee?Thanks
2. That's similar to a recent post about SHM in a spring and mass system http://hyperphysics.phy-astr.gsu.edu.../pendl.html#c2

simple pendulums are a bit different in that they approximate SHM (because the restoring force is part of a vector triangle) you can show SHM by using a small angle approximation - the approximation of SHM is close when the angle is 'small'

http://hyperphysics.phy-astr.gsu.edu.../pendl.html#c2
3. (Original post by CalissaRelics)
Hi, How can I prove that a pendulum follows SHM? I have data from an experiment and the angle used is 20 degreesBefore using the T = 2pi*SqRoot(L/g) I want to say the Pendulum follows SHM Could someone help me about how I can prove it pleaseeeeeeeeeeeee?Thanks
You may want to watch this video starting at 27:48 to see the "proof". You may want to double-check with your teacher about the angle (20 deg) you use. If this is the angle given by your teacher, then use it.

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