What is the theory behind the compound pendulum? And why must it be released at a small angle ( 10 degrees)?
Also what reason is there for having a massless string for the simple pendulum?
Small angle is used so you can use the approximation sin X=tan X and make math easier
massless string is used for the same reason (you should calculate an Integral using mass/length of the string etc)
Note also that the pendulum is frictionless (and we insist that physics describes the real world !!!)
Lecture 10 Hooke’s Law Springs Simple Harmonic Motion Pendulum Small Angle Approximation
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