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written by Wolfgang Christian
The Ejs Free Fall Cartesian model displays the dynamics of a ball dropped near the surface of Earth onto a platform.  The initial conditions for the ball are an initial positive velocity in the x direction and zero initial velocity in the y direction.  The coefficient of restitution for the ball's collision with the platform is less than one.  You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.  

Ejs Free Fall Cartesian 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_FreeFallCartesian.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).
Subjects Levels Resource Types
Classical Mechanics
- Applications of Newton's Laws
- Motion in Two Dimensions
= Projectile Motion
- High School
- Lower Undergraduate
- Instructional Material
= Activity
= Curriculum support
= Interactive Simulation
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- application/java
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Access Rights:
Free access
Restriction:
© 2008 Wolfgang Christian
Additional information is available.
Keywords:
Easy java Simulations, Ejs, OSP, Open Source Physics, bouncing ball, free fall, gravity, projectile motion, two dimensions
Record Creator:
Metadata instance created June 2, 2008 by Mario Belloni
Record Updated:
June 5, 2014 by Andreu Glasmann
Last Update
when Cataloged:
June 1, 2008
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.
  • 9-12: 4E/H9. Many forms of energy can be considered to be either kinetic energy, which is the energy of motion, or potential energy, which depends on the separation between mutually attracting or repelling objects.
4F. Motion
  • 9-12: 4F/H1. The change in motion (direction or speed) of an object is proportional to the applied force and inversely proportional to the mass.
  • 9-12: 4F/H4. Whenever one thing exerts a force on another, an equal amount of force is exerted back on it.

11. Common Themes

11B. Models
  • 6-8: 11B/M1. Models are often used to think about processes that happen too slowly, too quickly, or on too small a scale to observe directly. They are also used for processes that are too vast, too complex, or too dangerous to study.
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
W. Christian, Computer Program EJS FREE FALL CARTESIAN MODEL, Version 1.0 (2008), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499).
AJP/PRST-PER
W. Christian, Computer Program EJS FREE FALL CARTESIAN MODEL, Version 1.0 (2008), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499>.
APA Format
Christian, W. (2008). Ejs Free Fall Cartesian Model (Version 1.0) [Computer software]. Retrieved October 25, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499
Chicago Format
Christian, Wolfgang. "Ejs Free Fall Cartesian Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499 (accessed 25 October 2014).
MLA Format
Christian, Wolfgang. Ejs Free Fall Cartesian Model. Vers. 1.0. Computer software. 2008. Java (JRE) 1.5. 25 Oct. 2014 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Ejs Free Fall Cartesian Model}, Month = {June}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian
%T Ejs Free Fall Cartesian Model
%D June 1, 2008
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D June 1, 2008
%T Ejs Free Fall Cartesian Model
%7 1.0
%8 June 1, 2008
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=7347&DocID=499


Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

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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Ejs Free Fall Cartesian 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 Ejs Free Fall Cartesian Model.

relation by Mario Belloni
Covers the Same Topic As Virtual Laboratory: Potential Energy

This lesson plan from the University of Oregon Virtual Laboratory provides a very structured lab for students to investigate the motion of a bouncing ball, then apply their learning to a simulated situation.

relation by Caroline Hall
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 Ejs Free Fall Cartesian Model.

relation by Caroline Hall

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