Translations

Code	Language		Translator	Run

Credits

weelookang@gmail.com; Francisco Esquembre; Felix J. Garcia Clemente

. Core Functionality and Learning Objective:

The primary purpose of this resource is to allow users to experimentally determine the relative strength (elasticity) of different rubber bands when used in a hammock setup. The core learning goal is focused on understanding the concept of elasticity through a hands-on, albeit virtual, interaction.

• Teacher Focus: The "For Teachers" section explicitly states the learning objective: "The experiment is to determine which Rubberband connected to the hammock is stronger."
• User Interaction: The applet allows users to "drag chosen weights onto the desired hammock" and then "press the Play button" to observe the hammock's movement under the load.
• Comparative Analysis: The applet "shows the distance from its original position" when a weight is applied. This allows users to "compare with the other" rubber band and "conclude which Rubber Band is suitable."

2. Technical Details and Accessibility:

The resource is developed as an HTML5 applet using JavaScript, making it embeddable and likely accessible across various devices without the need for specific plugins.

• Embeddability: The resource provides an embed code: <iframe width="100%" height="100%" src="https://iwant2study.org/lookangejss/02_newtonianmechanics_8oscillations/ejss_model_Hammock/Hammock_Simulation.xhtml " frameborder="0"></iframe>, indicating its ease of integration into web pages.
• Development Tools: The second source explicitly states: "Compiled with EJS 6.0 (191124)," identifying the Easy JavaScript Simulations (EJS) toolkit as the development environment. This is further supported by a "Popular Tag" "EasyJavaScriptSimulation5" in the first source and a related link "Easy Java/JavaScript Simulations Toolkit https://www.um.es/fem/EjsWiki/ vy Francisco Esquembre and Félix Jesús Garcia Clemente."

3. Content and Structure of the Resource Page:

The main page for the applet on the Open Educational Resources platform follows a structured format common for educational resources.

• Breadcrumbs: Navigation is facilitated by breadcrumbs: "Home > Elasticity of Rubber Bands for a hammock HTML5 Applet Javascript".
• Key Information: The page includes the title, category (Physics, Dynamics, elasticity), embed options, translations (though none are listed), and credits attributing the work to specific individuals.
• Teacher Guidance: A dedicated "For Teachers" section provides a brief overview of the initial setup and how students can interact with the simulation to achieve the learning goals.
• Links and Resources: The page provides direct links to the applet ("https://sg.iwant2study.org/ospsg/index.php/974") and a version history link ("https://weelookang.blogspot.com/2020/07/the-elasticity-of-rubber-bands-for.html"). It also includes sections for "Research," "Video," and "Other Resources," although these sections are marked as "[texthttps://www.um.es/fem/EjsWiki/Main/EJSLicense and contact fem@um.es directly."

In summary, the "Elasticity of Rubber Bands for a Hammock" HTML5 applet is a focused, interactive tool designed to teach the concept of elasticity through a virtual experiment. It is part of a larger, well-established collection of open educational resources in physics from Singapore, built using the EJS toolkit and licensed under Creative Commons for broad accessibility and use.

 

Elasticity of Rubber Bands for a Hammock: A Study Guide

Quiz

Answer the following questions in 2-3 sentences each.

1. What is the primary goal of the experiment described in the applet?
2. What physical property of the rubber bands is being investigated in this simulation?
3. What are the user-controlled variables in this simulation?
4. How does the applet visually represent the effect of different weights on the hammock?
5. What information is provided to the user to help them compare the strength of different rubber bands?
6. What does the term "elasticity" refer to in the context of the rubber bands?
7. Besides the hammock simulation, what other physics-related simulations are mentioned on the same webpage? Provide one example.
8. For what educational levels or subjects might this simulation be appropriate?
9. Who are the creators credited for this simulation?
10. What might a teacher ask students to do with this simulation as part of a lesson?

Quiz Answer Key

1. The primary goal of the experiment is to determine which rubber band connected to the hammock is stronger. This is achieved by observing the displacement of the hammock under different weights for each rubber band.
2. The simulation investigates the elasticity of the rubber bands. Elasticity refers to the ability of the rubber bands to deform under a load and return to their original shape when the load is removed.
3. The user can control the weights (10g to 60g) that are placed on the hammock and presumably choose which rubber band is connected (though this is implied rather than explicitly stated in the provided text). The user also controls when the simulation is played.
4. The applet visually represents the effect of different weights by showing the hammock moving downwards from its original position. The distance of this displacement is also displayed, allowing for a quantitative comparison.
5. The applet shows the distance the hammock moves from its original position when a weight is applied. By comparing this distance for the same weight across different (implied) rubber bands, the user can conclude which rubber band is stronger (less displacement for the same weight indicates a stronger rubber band).
6. In this context, elasticity refers to the rubber band's ability to stretch when a weight is applied to the hammock and then return to its original length once the weight is removed. A more elastic (or stronger in this context) rubber band will stretch less under the same weight.
7. The webpage lists numerous other physics-related simulations, such as "Strength of an Electromagnet on paper clips JavaScript HTML5 Applet Simulation Model" and "Kinetic Theory of Gases HTML5 Applet JavaScript". These cover a wide range of physics topics.
8. Based on the content and the mention of "Primary School Science" in relation to other listed applets, this simulation could be appropriate for upper elementary or middle school levels to introduce concepts of force, weight, and elasticity in a visual and interactive way.
9. The creators credited for this simulation are weelookang@gmail.com, Francisco Esquembre, and Felix J. Garcia Clemente.
10. A teacher might ask students to predict how different weights will affect the hammock's displacement for a given rubber band, conduct trials with various weights, compare the displacement for different (implied) rubber bands under the same weight, and draw conclusions about the relative strength or elasticity of the rubber bands.

Essay Format Questions

1. Discuss how this simulation could be used in a classroom setting to teach the concept of elasticity. What are the strengths and limitations of using this type of interactive model compared to physical experiments?
2. Explain the relationship between the weight placed on the hammock and the resulting displacement, considering the elastic properties of the rubber bands. How could this simulation be used to illustrate Hooke's Law (even if not explicitly mentioned)?
3. The webpage lists numerous other simulations. Analyze the breadth of topics covered and discuss the potential benefits of having such a collection of open educational resources for science education.
4. Considering the user interaction with the simulation (dragging weights, pressing play, observing displacement), evaluate how this design promotes active learning and scientific inquiry among students.
5. The experiment aims to determine which rubber band is "stronger." Define what "stronger" might mean in this context, relating it to the elastic properties of the rubber bands and the observed behavior in the simulation. How could the experiment be modified or expanded to provide a more quantitative measure of strength or elasticity?

Glossary of Key Terms

• Elasticity: The ability of a material to deform under an applied force and return to its original shape and size once the force is removed.
• Simulation: A computer-based model that imitates a real-world process or system, allowing users to interact with and observe the effects of different variables.
• Applet: A small application, often written in Java or JavaScript, that runs within another application, typically a web browser.
• Open Educational Resources (OER): Teaching, learning, and research materials that are freely available for use, adaptation, and sharing.
• Displacement: The change in position of an object from its original location, often measured as a vector quantity (having both magnitude and direction).
• Weight: The force exerted on an object due to gravity. It is directly proportional to the object's mass.
• Newtonian Mechanics: A branch of classical mechanics concerned with the motion of macroscopic objects under the action of forces.
• HTML5: The latest evolution of the standard Hypertext Markup Language, used for structuring and presenting content on the World Wide Web.
• JavaScript: A scripting language commonly used to add interactivity and dynamic effects to websites and web applications.

Sample Learning Goals

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For Teachers

Initial Setup.

The experiment is to determine which Rubberband connected to the hammock is stronger.

Weights (10g,20g,30g,40g,50g,60g) are positioned next to the hammock for the user to choose.

https://sg.iwant2study.org/ospsg/index.php/974

Direct Link

 

User is able to drag chosen weights onto the desired hammock.

https://sg.iwant2study.org/ospsg/index.php/974

Direct Link

 

When the user presses the Play button, the hammock will move according to the weight on it. 

The distance from its original position is shown and can be compared with the other.

This is how the user can conclude which Rubber Band is suitable.

https://sg.iwant2study.org/ospsg/index.php/974

Direct Link

Research

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Video

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Version

1. https://weelookang.blogspot.com/2020/07/the-elasticity-of-rubber-bands-for.html

Other Resources

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