Good Vibrations: The Simple Harmonic Oscillator

Wikimedia Commons image of the simple pendulum
Physics is the expanding brain meme. There are layers of complexity to your models.
The quadratic approximation for a potential well. https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Map%3A_Physical_Chemistry_(McQuarrie_and_Simon)/13%3A_Molecular_Spectroscopy/13-05._Overtones_Are_Observed_in_Vibrational_Spectra; shared under Creative Commons licence.
Via the excellent Hyperphysics — http://hydrogen.physik.uni-wuppertal.de/hyperphysics/hyperphysics/hbase/oscdr.html
Tiny, joyful physicist
Everything is fine
Via Open University

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