Where Do I Start? Deriving Equations of Motion

[jeff0928]

Show that

After some arguments about the equation and some other shenanigans beyond this question, we find that

With the equation equaling zero, we can derive equations of motion.

 

[Mark44]

Show that

View attachment 81443

After some arguments about the equation and some other shenanigans beyond this question, we find that
View attachment 81444
With the equation equaling zero, we can derive equations of motion.

What's your question? Your title, "Where do I start" doesn't provide much guidance.

 

[jeff0928]

What's your question? Your title, "Where do I start" doesn't provide much guidance.

I'm just not even sure what my first step would be in this case.

 

[mfb]

To show some property of the Lagrangian, you first need the Lagrangian.
We don't know where to start if you do not share the full problem.