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written by Wolfgang Christian
The Balls in a Box model shows that a system of particles is very sensitive to its initial conditions. In general, an isolated system of many particles that is prepared in a nonrandom configuration will change in time so as to approach its most random configuration where it is in equilibrium. This model explores what happens if the initial conditions are chosen in a very special way.

The default initial condition corresponds to eight stationary particles perfectly aligned on the x-axis. Two particles approach from the left and the right. What happens when these particles collide with the eight stationary particles? The Ejs model solves Newton's second law of motion numerically but pauses when a collision is detected. This is called an Ejs event. Conservation of energy and momentum are applied at the event and the simulation is resumed.

The Balls in a Box 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 ejs_sto_BallsInBox.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 classical mechanics are available.  They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Please note that this resource requires at least version 1.5 of Java.
View the source code document attached to this resource
Subjects Levels Resource Types
Classical Mechanics
- Linear Momentum
= Conservation of Linear Momentum
- Newton's Second Law
= Interacting Objects
- Newton's Third Law
= Action/Reaction
Thermo & Stat Mech
- Kinetics and Dynamics
= Approach to Equilibrium
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
Program released under GNU-GPL. Narrative is copyrighted.
License:
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Wolfgang Christian
Keywords:
molecular dynamics, sensitivity to initial conditions
Record Cloner:
Metadata instance created November 16, 2008 by Wolfgang Christian
Record Updated:
June 2, 2014 by Andreu Glasmann
Last Update
when Cataloged:
November 15, 2008
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
W. Christian, Computer Program BALLS IN A BOX MODEL, Version 1.0 (2008), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913).
AJP/PRST-PER
W. Christian, Computer Program BALLS IN A BOX MODEL, Version 1.0 (2008), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913>.
APA Format
Christian, W. (2008). Balls in a Box Model (Version 1.0) [Computer software]. Retrieved July 31, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913
Chicago Format
Christian, Wolfgang. "Balls in a Box Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913 (accessed 31 July 2014).
MLA Format
Christian, Wolfgang. Balls in a Box Model. Vers. 1.0. Computer software. 2008. Java 1.5. 31 July 2014 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Balls in a Box Model}, Month = {November}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian
%T Balls in a Box Model
%D November 15, 2008
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D November 15, 2008
%T Balls in a Box Model
%7 1.0
%8 November 15, 2008
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=8307&DocID=913


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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Style.org: Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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