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Free Fall 3D Model
written by Wolfgang Christian
The Ejs Free Fall 3D model displays the three-dimensional dynamics of a ball dropped near the Earth surface onto a platform.  The initial conditions for the ball are zero initial velocities in the x, y, and z directions.  The coefficient of restitution for the ball's collision with the platform is less than one.  The initial height of the ball can be changed by dragging it when the simulation is paused. The simulation is part of the Open Source Physics Project. You can modify it and allow for different initial conditions, parameters or look.

Ejs Free Fall 3D 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_newton_FreeFall3D.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 Newtonian 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 (JRE).
1 source code document is available
Subjects Levels Resource Types
Classical Mechanics
- Gravity
- Motion in One Dimension
= Gravitational Acceleration
- Lower Undergraduate
- High School
- Instructional Material
= Activity
= Interactive Simulation
Intended Users Formats Ratings
- Educators
- Learners
- Professional/Practitioners
- application/java
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Access Rights:
Free access
© 2008 Wolfgang Christian
Additional information is available.
Easy Java Simulations, Ejs, OSP, Open Source Physics, free fall, gravity, three dimensions
Record Creator:
Metadata instance created June 2, 2008 by Mario Belloni
Record Updated:
June 21, 2014 by Wolfgang Christian
Last Update
when Cataloged:
June 1, 2008
Other Collections:

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Record Link
AIP Format
W. Christian, Computer Program FREE FALL 3D MODEL, Version 1.0 (2008), WWW Document, (
W. Christian, Computer Program FREE FALL 3D MODEL, Version 1.0 (2008), <>.
APA Format
Christian, W. (2008). Free Fall 3D Model (Version 1.0) [Computer software]. Retrieved March 3, 2021, from
Chicago Format
Christian, Wolfgang. "Free Fall 3D Model." Version 1.0. (accessed 3 March 2021).
MLA Format
Christian, Wolfgang. Free Fall 3D Model. Vers. 1.0. Computer software. 2008. Java (JRE) 1.5. 3 Mar. 2021 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Free Fall 3D Model}, Month = {June}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian
%T Free Fall 3D Model
%D June 1, 2008
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D June 1, 2008
%T Free Fall 3D Model
%7 1.0
%8 June 1, 2008

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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.

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

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