Physics - stereoboy/Study GitHub Wiki 클립 물리학 https://www.youtube.com/playlist?list=PLvitForcsI6Os7tomTszFLWkcqbhfPFP7 Issues The Simple Pendulum https://www.acs.psu.edu/drussell/Demos/Pendulum/Pendula.html#:~:text=A%20simple%20pendulum%20consists%20of,and%20forth%20with%20periodic%20motion. https://ghebook.blogspot.com/2020/06/simple-pendulum.html https://namu.wiki/w/%EB%8B%A8%EC%A7%84%EC%9E%90