# How can I find a Lagrangian

## Homework Statement

B is 10kg
C is 20kg
can I find a lagrangian for this system? If so how?

Diagram: http://imgur.com/j811rzw

L=T-V
Kinetic = .5mv^2
Potential = mgh

## The Attempt at a Solution

I know the kinetic energy must be 0 right? How could I find the potential?

## Answers and Replies

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kuruman
Homework Helper
Gold Member
Hi Boltzmann Oscillation and welcome to PF.

Yes, the kinetic energy is zero. If you take the zero of potential energy to be at the same height as the lights, the potential energy will also be zero, so the Lagrangaian is zero. May I ask why you are looking for the Lagrangian in relation to a statics problem?

Hi Boltzmann Oscillation and welcome to PF.

Yes, the kinetic energy is zero. If you take the zero of potential energy to be at the same height as the lights, the potential energy will also be zero, so the Lagrangaian is zero. May I ask why you are looking for the Lagrangian in relation to a statics problem?

I have statics class and this was assigned but I am quite bored with statics. I want to apply what ive learned in calculus and physics courses. Lagrangian are only used for moving objects? Thank you so much for the help.

kuruman