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Falling in Fluid Model
written by Wolfgang Christian
The Falling in Fluid model shows a sphere falling through a fluid.  The sphere is acted on by gravitational, buoyant, and viscous drag forces acting at the interface between the fluid and the object.  At high speed, the drag force is proportional to the square of the speed whereas at low speed it is proportional to the speed.  These regimes are characterized by the Reynolds number and this model computes the viscous drag force using a phenomenological equation that depends on the Reynolds number.

The Falling in Fluid 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_mech__fluids_FallingInFluid.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
- Applications of Newton's Laws
- General
- Motion in One Dimension
= Velocity
- Newton's Second Law
= Force, Acceleration
Fluid Mechanics
- Dynamics of Fluids
= Viscosity
- High School
- Lower Undergraduate
- Middle School
- Instructional Material
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 0.0/5

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license. Additional information is available.
Rights Holder:
Wolfgang Christian
Stokes law, buoyancy, buoyant, drag, viscous
Record Cloner:
Metadata instance created May 17, 2010 by Wolfgang Christian
Record Updated:
June 6, 2014 by Andreu Glasmann
Last Update
when Cataloged:
May 17, 2010
Other Collections:

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Record Link
AIP Format
W. Christian, Computer Program FALLING IN FLUID MODEL, Version 1.0 (2010), WWW Document, (
W. Christian, Computer Program FALLING IN FLUID MODEL, Version 1.0 (2010), <>.
APA Format
Christian, W. (2010). Falling in Fluid Model (Version 1.0) [Computer software]. Retrieved July 20, 2024, from
Chicago Format
Christian, Wolfgang. "Falling in Fluid Model." Version 1.0. (accessed 20 July 2024).
MLA Format
Christian, Wolfgang. Falling in Fluid Model. Vers. 1.0. Computer software. 2010. Java 1.5. 20 July 2024 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Falling in Fluid Model}, Month = {May}, Year = {2010} }
Refer Export Format

%A Wolfgang Christian %T Falling in Fluid Model %D May 17, 2010 %U %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Christian, Wolfgang %D May 17, 2010 %T Falling in Fluid Model %7 1.0 %8 May 17, 2010 %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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Falling in Fluid 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 Falling in Fluid Model.

relation by Wolfgang Christian

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