Physics Notes - Herong's Tutorial Notes - v3.24, by Herong Yang
Hamilton's Principle in Generalized Coordinates
This section provides a quick introduction to the Hamilton's Principle in Generalized Coordinates.
The nice thing about the Hamilton's Principle is that it it independent of coordinate systems. So the Hamilton's Principle stay the same: the true position function q(t) of a system is a stationary point of the Action S[q(t)] functional.
Mathematically, a stationary point of Action S[q(t)] functional is a function q(t), where the functional differential of S[q(t)] is zero. This can be expressed as:
d(S[q(t)]) / d(q(t)) = 0
# functional differential of S[q(t)]
or:
d(∫ L(q,q',t)dt) / dq = 0
# Replaced S with its definition
Hamilton's Principle is also called Stationary Action.
Table of Contents
Introduction of Frame of Reference
Introduction of Special Relativity
Time Dilation in Special Relativity
Length Contraction in Special Relativity
The Relativity of Simultaneity
Minkowski Spacetime and Diagrams
►Introduction of Generalized Coordinates
Generalized Coordinates and Generalized Velocity
Simple Pendulum Motion in Generalized Coordinates
►Hamilton's Principle in Generalized Coordinates
Lagrange Equations in Generalized Coordinates
Lagrange Equations on Simple Pendulum
What Is Legendre Transformation
Hamilton Equations in Generalized Coordinates