Lagrangian in Polar Coordinates (8.5)

In this video, I derive the Lagrangian in polar coordinates for a spherically symmetric potential, pursuant to the study of planetary motion.

[@grislygranger8983]

Thank you for this sir. I have a question, will we get the same angular and radial if we have U(r, phi)?

[@sandeepchauhan6836]

Thx from india sir

[@user-rg5qr6zn9m]

Thank you

[@sukantachatterjee6853]

Thank you so much sir

[@jameyatesmauriat6116]

Where can I find concept 8.4 please I’m newbie here?

[@jacobvandijk6525]

WARNING: The only potential in this video is in the red box and is called U(r). In my opinion, this is a bad choice for educational reasons; my potentials are in volts (V). Even worse, all the other U's in the video are potential energies; even though he keeps calling them potentials most of the time.