APS Excellence in Physics Education Award
November 2019

Education Prize Logo
Science SPORE Prize
November 2011

NSF Logo
The Open Source Physics Project is supported by NSF DUE-0442581.

Falling in Fluid Model Documents

This material has 2 associated documents. Select a document title to view a document's information.

Main Document

Falling in Fluid Model 

written by Wolfgang Christian

The Falling in Fluid model shows a sphere falling through a fluid.  It is a supplemental simulation for an article by Pirooz Mohazzabi "Falling and Rising in Water" in the The Physics Teacher 48 (7), 478-479 (2010).  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.

Last Modified June 6, 2014

This file has previous versions.

Source Code Documents

Falling in Fluid Source Code 

The source code zip archive contains an XML representation of the Falling in Fluid model.   Unzip this archive in your EJS workspace to compile and run this model using EJS.

Last Modified May 17, 2010

OSP Projects:
Open Source Physics - EJS Modeling
Physlet Physics
Physlet Quantum Physics
STP Book