One Equation to Rule Them ALL

Let's Find the Theory of Everything and Break Conservation of Energy. Why does a ball fly along a parabola? Why does Anything move the way it does? Why is energy conserved? IS the energy of our universe actually conserved? (Spoiler: Nope) What is the Principle of Least Action? What is a Lagrangian? Where does the Euler-Lagrange equation come from? What’s the difference between Newtonian and Hamiltonian mechanics? How does Noether’s theorem work? Hi, i’m a physicist and i’d like to introduce you to the Principle of Stationary Action, also called Hamilton’s Principle. It’s an equation that tells us how every single thing in our universe moves. It not only gives us Newton's equation, but also covers electromagnetism, and even general relativity. It leads us to why and when energy and momentum are conserved and it plays an important role in quantum physics. 0:00 The closest we’ve come to a theory of everything 6:01 The Euler-Lagrange equation 10:12 Why is energy conserved? (Noether’s theorem explained) 12:11 Energy is not conserved (1) Roadmap of the parallel development of the Newtonian and variational principles approaches to classical mechanics by https://commons.wikimedia.org/wiki/User:David,_but_not_Hilbert from https://commons.wikimedia.org/wiki/File:Classical_mechanics_roadmap.svg licensed under the Creative Commons Attribution-Share Alike 4.0 International license https://creativecommons.org/licenses/by-sa/4.0/deed.en (2) Temperature map of the cosmic microwave background measured by Planck spacecraft created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab) from https://noirlab.edu/public/images/CMB/ licensed under the Creative Commons Attribution-Share Alike 4.0 International license https://creativecommons.org/licenses/by-sa/4.0/deed.en ABOUT THIS CHANNEL HI, i'm a physicist trying to explain how science ACTUALLY works. If you like this video, please subscribe :) thank you. https://www.youtube.com/@HowItActuallyWorksScience?sub_confirmation=1 #science #physics