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Free Rotation Model
written by Wolfgang Christian
The Free Rotation model shows the torque-free motion of a rectangular block.  The model displays a space frame view showing a constant angular momentum arrow and a body group containing a block and body-axis arrows. This model is designed for the study of torque-free precession.  The tips of the body frame axis arrows trace trajectories to illustrate stable and unstable rotation of the block about a principal axes. A second window displays the body frame view with space frame xyz-axes orbiting the block.

The Free Rotation model was developed using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the  ejs_csm_ch17_FreeRotation.jar file will run the program if Java is installed.

Please note that this resource requires at least version 1.5 of Java.
1 source code document is available
Subjects Levels Resource Types
Classical Mechanics
- Rotational Dynamics
= Moment of Inertia
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Educators
- Learners
- application/java
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Access Rights:
Free access
Program released under GNU-GPL. Narrative is copyrighted.
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Wolfgang Christian
angular velocity, rigid body
Record Cloner:
Metadata instance created February 10, 2011 by Wolfgang Christian
Record Updated:
June 6, 2014 by Andreu Glasmann
Last Update
when Cataloged:
February 10, 2011
Other Collections:

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4E. Energy Transformations
  • 6-8: 4E/M4. Energy appears in different forms and can be transformed within a system. Motion energy is associated with the speed of an object. Thermal energy is associated with the temperature of an object. Gravitational energy is associated with the height of an object above a reference point. Elastic energy is associated with the stretching or compressing of an elastic object. Chemical energy is associated with the composition of a substance. Electrical energy is associated with an electric current in a circuit. Light energy is associated with the frequency of electromagnetic waves.

AAAS Benchmark Alignments (1993 Version)


E. Energy Transformations
  • 4E (9-12) #2.  Heat energy in a material consists of the disordered motions of its atoms or molecules. In any interactions of atoms or molecules, the statistical odds are that they will end up with less order than they began?that is, with the heat energy spread out more evenly. With huge numbers of atoms and molecules, the greater disorder is almost certain.
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Record Link
AIP Format
W. Christian, Computer Program FREE ROTATION MODEL, Version 1.0 (2011), WWW Document, (
W. Christian, Computer Program FREE ROTATION MODEL, Version 1.0 (2011), <>.
APA Format
Christian, W. (2011). Free Rotation Model (Version 1.0) [Computer software]. Retrieved June 21, 2024, from
Chicago Format
Christian, Wolfgang. "Free Rotation Model." Version 1.0. (accessed 21 June 2024).
MLA Format
Christian, Wolfgang. Free Rotation Model. Vers. 1.0. Computer software. 2011. Java 1.5. 21 June 2024 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Free Rotation Model}, Month = {February}, Year = {2011} }
Refer Export Format

%A Wolfgang Christian %T Free Rotation Model %D February 10, 2011 %U %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Christian, Wolfgang %D February 10, 2011 %T Free Rotation Model %7 1.0 %8 February 10, 2011 %U

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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 Electronic References.

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Free Rotation Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Free Rotation Model.

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