Ejs TPT Ladder Demonstration Model

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written by Mario Belloni

This model displays the statics and dynamics of a ladder leaning against a wall. The standard (textbook) statement of this problem assumes that there is no frictional force between the wall and the ladder, but a frictional force between the ground and the ladder. In the simulation, students set the initial lean angle and the coefficients of static and kinetic friction between the floor and the ladder. This resource includes background information and related problems.

Editor's Note: In teaching about equilibrium, instructors may want to use "bite-size" pieces to slowly build concepts. This simulation presents the concept with very simple graphics, appropriate for the introductory class. See Related Materials for a more complex simulation that introduces a person standing on the ladder.

This item was created with Easy Java Simulations (EJS), a modeling tool that allows users without formal programming experience to generate computer models and simulations. To run the simulation, simply click the Java Archive file below. To modify or customize the model, see related materials for installing and running the EJS Modeling and Authoring Tool.

Please note that this resource requires at least version 1.5 of Java (JRE).

.jar

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Last Modified: June 5, 2014
previous versions

1 source code document is available

Subjects	Levels	Resource Types
Classical Mechanics - Newton's Second Law = Force, Acceleration - Statics of Rigid Bodies = Equilibrium	- High School - Lower Undergraduate	- Instructional Material = Activity = Interactive Simulation

Appropriate Courses	Categories	Ratings
- Conceptual Physics - Algebra-based Physics - AP Physics	- Activity - New teachers	Currently 0.0/5 Want to rate this material? Login here!

Intended Users:: Learner
Educator
Professional/Practitioner
Format:: application/java
Access Rights:: Free access
Restriction:: © 2008 Mario Belloni
Additional information is available.
Keywords:: Easy Java Simulations, Ejs, OSP, Open Source Physics, ladder, ladder demo, ladder problem, statics, tpt ladder
Record Creator:: Metadata instance created August 17, 2008 by Mario Belloni
Record Updated:: May 27, 2020 by Bruce Mason
Last Update when Cataloged:: August 18, 2008
Other Collections:: The PSRC

The Physics Source

The Open Source Physics

Confusion

Author: Michael Grams
Posted: December 2, 2009 at 3:48PM
Source: The Open Source Physics collection

The ladder falls for any value of theta and any value of the coefficient of static friction. What am I missing?

» reply

Re: Confusion

Author: Michael Grams
Posted: Dec 2, 2009 4:55PM UTC

> On Dec 02, 2009, Michael Grams posted:
>
> The ladder
> falls for any value of theta and any value of the
> coefficient of static friction. What am I missing?

Nevermind, I realized what the problem was. You have to hit enter after putting in your values of theta and mu.

» reply

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AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4F. Motion

9-12: 4F/H4. Whenever one thing exerts a force on another, an equal amount of force is exerted back on it.
9-12: 4F/H7. In most familiar situations, frictional forces complicate the description of motion, although the basic principles still apply.

11. Common Themes

11B. Models

6-8: 11B/M4. Simulations are often useful in modeling events and processes.
9-12: 11B/H3. The usefulness of a model can be tested by comparing its predictions to actual observations in the real world. But a close match does not necessarily mean that other models would not work equally well or better.

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Record Link

<a href="https://www.compadre.org/precollege/items/detail.cfm?ID=7849">Belloni, Mario. "Ejs TPT Ladder Demonstration Model." Version 1.0.</a>

AIP Format

M. Belloni, Computer Program EJS TPT LADDER DEMONSTRATION MODEL, Version 1.0 (2008), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635).

AJP/PRST-PER

M. Belloni, Computer Program EJS TPT LADDER DEMONSTRATION MODEL, Version 1.0 (2008), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635>.

APA Format

Belloni, M. (2008). Ejs TPT Ladder Demonstration Model (Version 1.0) [Computer software]. Retrieved September 17, 2024, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635

Chicago Format

Belloni, Mario. "Ejs TPT Ladder Demonstration Model." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635 (accessed 17 September 2024).

MLA Format

Belloni, Mario. Ejs TPT Ladder Demonstration Model. Vers. 1.0. Computer software. 2008. Java (JRE) 1.5. 17 Sep. 2024 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635>.

BibTeX Export Format

@misc{ Author = "Mario Belloni", Title = {Ejs TPT Ladder Demonstration Model}, Month = {August}, Year = {2008} }

Refer Export Format

%A Mario Belloni %T Ejs TPT Ladder Demonstration Model %D August 18, 2008 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635 %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Belloni, Mario %D August 18, 2008 %T Ejs TPT Ladder Demonstration Model %7 1.0 %8 August 18, 2008 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=7849&DocID=635

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The AIP Style presented is based on information from the AIP Style Manual.

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Ejs TPT Ladder Demonstration Model:

Same topic as LTU Physlet: Ladder Leaning Against a Wall

This is a related, but somewhat more complex Physlet which introduces an additional force: a person standing on the leaning ladder.

relation by Caroline Hall

Is Based On Easy Java Simulations Modeling and Authoring Tool

A link to the free Easy Java Simulations Modeling and Authoring tool, which is needed to modify the computational model used in the Ladder Demonstration model.

relation by Caroline Hall

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