# Imagine solving the equations of motion using the Lagrangian or the Hamiltonian

Imagine solving the equations of motion using the Lagrangian or the Hamiltonian

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1. KartoshkaKing says:

It’d be similar to a double pendulum, right?

2. Phantom-I0 says:

Anyone else think of that scene in Iron Man 2?

3. greenwizardneedsfood says:

Well, well, well. Guess who just created a homework problem

4. Ham_lap says:

This is great! And the little swing in the bonsai is the most adorable thing I’ve seen today!

5. Jas9191 says:

Is there an explanation why the smaller arm never spins clockwise? It almost does but always swings back before completing a full turn. It might be even a half turn or less than a full 360 but it’s at least bounded at less than a full turn clockwise in this video.

6. pawbf says:

7. alpagator says:

Would be better if the bar were inline with each other. Think about the lateral torques happening in this thing, it’s annoying.

8. bluemtfreerider says:

having classical mechanics 2 flashbacks lol…. I actually liked that class. You feel like a mathematical badass.

9. lobster280zx says:

I have three of these going all the time. I replace the 4 AA batteries every few months and it’s totally worth it.

10. 42koelkasten says:

In my advanced mechanics course we discussed it in a student presentation. I don’t remember how much of a pain the equations of motion were, I can probably still look up the recording of it.
There was an [art installation](https://youtube.com/watch?v=cYWvH06oQiM&feature=share) called ‘mobilarium’ somewhere in the Netherlands that used this principle but with 2×3 moving parts, driven by wind. Sadly it was torn down a few years ago and has been stowed away somewhere since.

11. bantou_41 says:

Ah yes, this is one of those systems where technically if you have all the values measured you should be able to predict its next step, but a small error in measurement leads to wildly different realities.

12. Ltrfsn says:

I want to and have the formulas lying around but I’m too stupid to do it.

13. Juliette-Eih says:

It’s so nice to see things that could make us think of constant motion

14. maktmissbrukare says:

“Por que no los dos?” – Routh

15. SmartFellar says:

Me too! I love bonsai trees. That spinny thing keeps blocking my view.

16. AsterTheBastard says:

What is this object called? I want one.

17. sixfingerdiscount says:

This reminds me so much of QWOP

18. artmobboss says:

Why is there not a little person sitting in the swing watching the funmill?

19. Giorgio_Sole says:

I wonder how long does it work without batteries it you just poke it

20. Suspicious-Impact994 says:

Where do I get this