Two Springs and a Pendulum Model

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written by Andrew Duffy

This interactive simulation allows students to explore the motion of two blocks oscillating on two horizontal springs, and compare those motions to that of a simple pendulum. Users can set a variety of values: mass, initial position, length and initial angle of the pendulum, and damping strength. Motion may be stepped or paused. Real-time graphs of motion, energy, and forces may be viewed or hidden. The author also provides a set of suggested activities to accompany the simulation.

This applet was created with EJS, Easy Java Simulations, a modeling tool that allows users without formal programming experience to generate computer models and simulations.

SEE RELATED ITEMS on this page for a link to the full index of Andrew Duffy's EJS simulations.

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Last Modified: February 24, 2016

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Subjects	Levels	Resource Types
Classical Mechanics - Newton's Second Law = Force, Acceleration General Physics - General Oscillations & Waves - Oscillations = Pendula	- Lower Undergraduate - Middle School - High School - Upper Undergraduate	- Instructional Material = Interactive Simulation - Audio/Visual = Movie/Animation

Intended Users	Formats	Ratings
- Learners - Educators	- application/java	Currently 0.0/5 Want to rate this material? Login here!

Mirror:: http://physics.bu.edu/~duffy/Ejs/…
Access Rights:: Free access
License:: This material is released under a GNU General Public License Version 3 license.
Rights Holder:: Andrew Duffy, Boston University
Keywords:: amplitude, angle, damping, oscillation, pendula, pendulum, periods, simple harmonic motion, simple harmonic oscillation, spring
Record Cloner:: Metadata instance created September 2, 2009 by Elijah Lee
Record Updated:: February 24, 2016 by Wolfgang Christian
Last Update when Cataloged:: August 27, 2009
Other Collections:: The Open Source Physics

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<a href="https://www.compadre.org/introphys/items/detail.cfm?ID=9410">Duffy, Andrew. "Two Springs and a Pendulum Model."</a>

AIP Format

A. Duffy, Computer Program TWO SPRINGS AND A PENDULUM MODEL, WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367).

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A. Duffy, Computer Program TWO SPRINGS AND A PENDULUM MODEL, <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367>.

APA Format

Duffy, A. (n.d.). Two Springs and a Pendulum Model [Computer software]. Retrieved July 16, 2025, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367

Chicago Format

Duffy, Andrew. "Two Springs and a Pendulum Model." https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367 (accessed 16 July 2025).

MLA Format

Duffy, Andrew. Two Springs and a Pendulum Model. Computer software. 16 July 2025 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367>.

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@misc{ Author = "Andrew Duffy", Title = {Two Springs and a Pendulum Model}, Month = {August}, Year = {2009} }

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%A Andrew Duffy %T Two Springs and a Pendulum Model %D August 27, 2009 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367 %O application/java

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%0 Computer Program %A Duffy, Andrew %D August 27, 2009 %T Two Springs and a Pendulum Model %8 August 27, 2009 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=9410&DocID=4367

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Two Springs and a Pendulum Model:

Is Part Of http://physics.bu.edu/~duffy/Ejs/

This is the full index of Easy Java Simulations (EJS) by author Andrew Duffy, created for first-semester introductory physics. EJS is a modeling tool developed by the Open Source Physics project.

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 Two Springs and a Pendulum Model.

relation by Wolfgang Christian

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