# Homework Help: A Lagrangian Dynamics Problem

1. May 31, 2010

### deniz120

1. The problem statement, all variables and given/known data

Hi all, I need to derive differantial equations of system with lagrange multiplier method, a disk is rolling and a bar is fixed onto the point of a disk

By deniz120 at 2010-05-31

2. Relevant equations

3. The attempt at a solution
please check my solution below, I derived T and V for Lagrange, all I need is help for constaints, lagrange multiplier equation. Thanks in advance:)

[PLAIN]http://img263.imageshack.us/img263/3659/tarama0001r.jpg [Broken]
By deniz120 at 2010-05-31]

Last edited by a moderator: May 4, 2017
2. May 31, 2010

### vela

Staff Emeritus
3. May 31, 2010

### deniz120

unfortunately nothing, I guess there is nonholonomic constraint
thanks

4. May 31, 2010

### vela

Staff Emeritus
It's not a nonholonomic constraint.

You have only two coordinates, β and θ. How are they related?

5. May 31, 2010

### deniz120

I guess you are right but that is the exact question that I m looking for the answer, how are they related:)

6. May 31, 2010

### vela

Staff Emeritus
Really? It's basic geometry. Consider the height of point B.