written by Wolfgang Christian

The EJS Molecular Dynamics Demonstration model is constructed using the Lennard-Jones potential truncated at a distance of 3 molecular diameters. The motion of the molecules is governed by Newton's laws, approximated using the Verlet algorithm with the indicated Time step. For sufficiently small time steps dt, the system's total energy should be approximately conserved. Users can select various initial configurations using the drop down menu.

Ejs Molecular Dynamics Demonstration model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the  js_stp_md_MolecularDynamicsDemo.jar file will run the program if Java is installed.  Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models.  Additional Ejs models for statistical mechanics are available.  They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

• Download ejs_md_teacher_MolecularDynamicsDemo.jar - 1229kb Java Archive File

Last Modified August 24, 2012

This file has previous versions.

A customized Molecular Dynamics Demo model designed to teach simple molecular dynamics concepts using a realistic simulation.  The middle school lesson packaged within this model was written by Barbara Christian for her science class.

• Download WhatIsTemperature.jar - 1392kb Java Archive File

Published October 10, 2010
Last Modified August 25, 2012

This file has previous versions.

A pdf file that provides additional documentation regarding customization of this simulation.

• Download molecular_dynamics_documentation.pdf - 166kb Adobe PDF Document

Published July 12, 2012
Last Modified August 9, 2012

This file is included in the full-text index.
This file has previous versions.

A middle school science lesson plan designed to teach temperature concepts using a realistic simulation.

• Download What_is_Temperature.pdf - 103kb Adobe PDF Document

Copyright by Barbara Christian.  Free for non-commercial use with attribution.

Published October 10, 2010
Last Modified October 12, 2010

This file is included in the full-text index.

Answer key with screen shots for the middle school science lesson plan.

• Download What_is_Temperature_Key.pdf - 203kb Adobe PDF Document

Copyright by Barbara Christian.  Free for non-commercial use with attribution.

Last Modified October 12, 2010

This file is included in the full-text index.

The source code zip archive contains an XML representation of the Molecular Dynamics Demo Model.  Unzip this archive in your Ejs workspace to compile and run this model using Ejs.

• Download ejs_md_teacher_MolecularDynamicsDemo.zip - 267kb Compressed File

Last Modified August 24, 2012

This file has previous versions.