PHY 711 Classical Mechanics and Mathematical Methods

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Presentation transcript:

PHY 711 Classical Mechanics and Mathematical Methods 10-10:50 AM MWF Olin 103 Plan for Lecture 7: Calculus of variation; Continue reading Chapt. 3 Brachistochrone problem Calculus of variation with constraints Application to classical mechanics 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Euler-Lagrange equation Alternate Euler-Lagrange equation 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Brachistochrone problem: (solved by Newton in 1696) http://mathworld.wolfram.com/BrachistochroneProblem.html A particle of weight mg travels frictionlessly down a path of shape y(x). What is the shape of the path y(x) that minimizes the travel time from y(0)=0 to y(p)=-2 ? 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Parametric equations for Brachistochrone: 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Parametric plot -- plot([theta-sin(theta), cos(theta)-1, theta = 0 .. Pi]) y x 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Summary of the method of calculus of variation -- 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Another example optimization problem: Determine the shape y(x) of a rope of length L and mass density r hanging between two points x1 y1 x2 y2 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Lagrange multiplier 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Summary of results 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Application to particle dynamics 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Application to particle dynamics Simple example: vertical trajectory of particle of mass m subject to constant downward acceleration a=-g. 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

http://www.hamilton2005.ie/ 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

http://rjlipton.wordpress.com 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

Potential energy Kinetic energy 9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7

9/12/2018 PHY 711 Fall 2018 -- Lecture 7