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Physical Pendulum Forces
written by Wolfgang Christian
The Physical Pendulum with Forces model displays the gravitational, normal, and friction forces acting on a mass attached to a pivoted rod.  These forces cause the mass to accelerate in the radially and tangentially with respect to pivot.  Although gravity is always downward, friction and normal force change direction in order to keep the mass in the same position on the stick. 

The Physical Pendulum Forces 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_newton_PhysicalPendulumForces.jar file will run the program if Java is installed.

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
- Rotational Dynamics
Oscillations & Waves
- Oscillations
= Physical Pendula
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Wolfgang Christian
angular velocity, friction force, normal force
Record Cloner:
Metadata instance created February 1, 2010 by Wolfgang Christian
Record Updated:
June 11, 2014 by Andreu Glasmann
Last Update
when Cataloged:
October 28, 2008
Other Collections:

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Record Link
AIP Format
W. Christian, Computer Program PHYSICAL PENDULUM FORCES, Version 1.0 (2010), WWW Document, (
W. Christian, Computer Program PHYSICAL PENDULUM FORCES, Version 1.0 (2010), <>.
APA Format
Christian, W. (2010). Physical Pendulum Forces (Version 1.0) [Computer software]. Retrieved August 24, 2017, from
Chicago Format
Christian, Wolfgang. "Physical Pendulum Forces." Version 1.0. (accessed 24 August 2017).
MLA Format
Christian, Wolfgang. Physical Pendulum Forces. Vers. 1.0. Computer software. 2010. Java (JRE) 1.5. 24 Aug. 2017 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Physical Pendulum Forces}, Month = {October}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian
%T Physical Pendulum Forces
%D October 28, 2008
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D October 28, 2008
%T Physical Pendulum Forces
%7 1.0
%8 October 28, 2008

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 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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Physical Pendulum Forces:

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 Physical Pendulum Forces.

relation by Wolfgang Christian
Supplements Physlet Physics: Chapter 4: Newton's Laws Illustration 4.2

The Physical Pendulum Forces model and Physlet Illustration 4.2 both cover rudimentary forces in terms of free body diagrams.

relation by Andreu Glasmann

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