Translations

Code	Language		Translator	Run

Credits

Fu-Kwun Hwang; Tan Wei Chiong; lookang

Briefing Document: Coriolis Effect Simulation and OER Resources

This document summarizes the key themes and ideas presented in the provided source, focusing on a Coriolis Effect 2D JavaScript simulation applet and related open educational resources.

Main Themes:

• Coriolis Effect Visualization: The primary focus is on providing an interactive simulation to help students visualize and understand the Coriolis effect. The applet allows users to observe the deflection of moving objects within a rotating reference frame.
• Open Educational Resources (OER): The source promotes the use of OER, specifically a JavaScript simulation applet, for teaching physics and related topics (geography, rotational motion). It emphasizes accessibility and adaptability for educational purposes.
• Hands-on Learning & Engagement: The document stresses the importance of hands-on activities alongside the simulation to reinforce understanding of the Coriolis effect.
• Simulation as a Tool: The resource highlights simulation as a powerful tool for visualizing abstract concepts and promoting interactive learning.
• Adaptability and Customization: The source provides the embed code to add the simulation into other webpages. There is evidence in the list of other resources that the simulation can be repurposed or remade to address other subjects.

Key Ideas and Facts:

• Definition of Coriolis Effect: "In physics, the Coriolis effect is a deflection of moving objects when they are viewed in a rotating reference frame. In a reference frame with clockwise rotation, the deflection is to the left of the motion of the object; in one with counter-clockwise rotation, the deflection is to the right."
• Simulation Functionality: The provided simulation allows users to:
• Observe the Coriolis effect in a 2D plane.
• Adjust parameters such as the rotation velocity ("W") of a rotating platform.
• Choose different observation points ("Ground (inertial seat)" or "spin stage").
• Simulate the trajectory of a "baby ball" thrown from the edge of the rotating platform.
• Hands-on Activities: The resource suggests activities including:
• Rotating paper with a marble as a projectile.
• Drawing a line across rotating paper to demonstrate deflection.
• Supplementary Resources: The document provides links to:
• YouTube videos explaining the Coriolis effect.
• Worksheets for hands-on activities.
• Other related physics simulations and resources from Open Source Physics @ Singapore.
• Licensing: "Contents are licensed Creative Commons Attribution-Share Alike 4.0 Singapore License." This allows for sharing and adaptation with attribution. Commercial use of the EasyJavaScriptSimulations Library requires a separate license.

Important Quotes:

• "In physics, the Coriolis effect is a deflection of moving objects when they are viewed in a rotating reference frame." (Defines the Coriolis effect)
• "[The simulation will] help you visualize the Coriolis effect in a 2D plane!" (Highlights the purpose of the simulation)
• "Another good hands-on idea is to get one student to rotate real paper with the globe the North Pole showing to turn the paper anti-clockwise, another student to plot using a pen a straight line across from equator to North pole, the pen mark will actually be bent due to the rotating paper. Try this! It is surprisingly good for students and they will have a better chance of getting what the Coriolis Effect is." (Emphasizes the importance of hands-on learning.)

Overall Significance:

The resource provides a valuable tool for educators seeking to teach the Coriolis effect in an engaging and interactive way. By combining a readily accessible JavaScript simulation with suggested hands-on activities, it aims to improve student understanding of this often-difficult concept. The emphasis on OER and adaptable resources promotes accessibility and customization for diverse educational settings. The comprehensive list of links helps users see how simulations can have a variety of real-world applications for learning different subjects.

 

Coriolis Effect: A Comprehensive Study Guide

I. Core Concepts

• Rotating Reference Frame: The perspective from which motion is observed, where the observer is also rotating. The Coriolis effect is only apparent in such frames.
• Inertial Frame of Reference: A frame of reference that is not accelerating. Newton's laws of motion hold true in inertial frames. Observers in inertial frames do not observe the Coriolis effect.
• Deflection: The apparent change in direction of a moving object as seen from a rotating reference frame. The direction of deflection depends on the direction of rotation.
• 2D Representation: A simplified model of the Coriolis effect that focuses on motion in a plane, useful for illustrating the basic principle.
• Simulation: A computer-based model that replicates the Coriolis Effect using adjustable parameters.
• Trajectory: The path a projectile takes when launched while the simulation is operating with particular settings, such as rotational velocity and the observer location.

II. Key Principles and Explanations

• The Coriolis Effect Definition: The apparent deflection of moving objects when viewed from a rotating reference frame. It is not a real force, but rather an effect of observing motion from a non-inertial (rotating) frame.
• Direction of Deflection:In a clockwise rotating frame, deflection is to the left of the object's motion.
• In a counter-clockwise rotating frame, deflection is to the right of the object's motion.
• Real-World Examples (Implied from the provided text, but helpful for understanding):Large-scale weather patterns.
• Ocean currents.
• Trajectory of long-range projectiles.
• Simulation Parameters:Observer Location: The choice of "Ground (inertial seat)" or "spin stage" changes the observed trajectory of the object.
• Rotating Terrace Velocity (W): Controls the speed and direction of rotation.
• Every Second Track: Shows the position of the projectile at one second intervals.
• Inertia seat axis: Shows the inertia icon after the projectile is launched.

III. Quiz: Short Answer

1. Explain the Coriolis effect in your own words, focusing on the role of the rotating reference frame.
2. How does the direction of rotation (clockwise vs. counter-clockwise) affect the direction of deflection caused by the Coriolis effect?
3. Why is the Coriolis effect described as an "apparent" force rather than a real force?
4. Describe a simple hands-on demonstration that can help students visualize the Coriolis effect, as suggested in the provided text.
5. In the simulation, what happens to the trajectory of the projectile when the rotational velocity (W) is set to zero? Why?
6. What does "observer location" refer to in the simulation, and how does changing it alter the observed motion?
7. How does the Coriolis effect influence large-scale weather patterns on Earth?
8. Explain why the Coriolis effect is not noticeable for small-scale motions, such as stirring a cup of coffee.
9. What are the limitations of using a 2D simulation to represent the Coriolis effect?
10. Describe a scenario where understanding the Coriolis effect would be crucial for accurate calculations or predictions.

Quiz Answer Key

1. The Coriolis effect is the apparent deflection of moving objects observed from a rotating reference frame. It arises because the observer is also rotating, causing objects moving in a straight line to appear to curve relative to the observer's frame.
2. In a clockwise rotating frame, the deflection is to the left of the object's motion. Conversely, in a counter-clockwise rotating frame, the deflection is to the right.
3. The Coriolis effect is an "apparent" force because it is not a true force causing the deflection, but rather a consequence of observing motion from a non-inertial, rotating frame of reference. An object not subject to external forces moves in a straight line in an inertial frame, but its motion appears curved in a rotating frame.
4. A simple demonstration involves having a student rotate a piece of paper with a globe showing the North Pole in a counter-clockwise direction, while another student plots a straight line with a pen from the equator to the North Pole. The pen mark will appear bent due to the rotation.
5. If the rotational velocity (W) is set to zero, there is no rotation, and therefore no Coriolis effect. The trajectory of the projectile will appear as a straight line from both the ground (inertial) and rotating reference frames.
6. The "observer location" refers to the frame of reference from which the projectile's motion is being viewed. When the observer location is set to the "Ground (inertial seat)" the observed motion will appear to travel in a straight line.
7. The Coriolis effect deflects large scale movements of air masses, such as trade winds and hurricanes. The direction of this deflection is dependent on the hemisphere.
8. The Coriolis effect is not noticeable for small-scale motions because the effect is proportional to the speed of the moving object and the rotation rate of the reference frame. In small scales and slow speeds, the Coriolis force is insignificant compared to other forces.
9. The 2D simulation simplifies the effect by restricting motion to a plane. It does not account for vertical motion or variations in the Coriolis effect at different latitudes on a sphere.
10. Understanding the Coriolis effect is crucial for accurately predicting the trajectories of long-range artillery shells or missiles, where even small deflections can result in significant errors over long distances.

IV. Essay Questions

1. Explain the concept of the Coriolis effect and its significance in understanding large-scale atmospheric and oceanic phenomena on Earth. Be sure to discuss the role of the rotating reference frame and provide specific examples.
2. Critically analyze the usefulness and limitations of the 2D JavaScript simulation applet in teaching the Coriolis effect. How does this tool aid in student understanding, and what aspects of the phenomenon are not adequately represented?
3. Compare and contrast the experience of observing motion from an inertial frame of reference versus a rotating frame of reference, with specific attention to how the Coriolis effect manifests in the latter.
4. Discuss the relationship between the Coriolis effect and the movement of air masses and ocean currents, including the formation of weather patterns and the distribution of heat around the globe.
5. Design an experiment or activity, beyond the examples provided, to demonstrate and explain the Coriolis effect to students. Consider different age groups and learning styles in your design.

V. Glossary of Key Terms

• Coriolis Effect: The apparent deflection of moving objects when viewed from a rotating reference frame.
• Reference Frame: The perspective from which motion is observed and measured.
• Inertial Frame: A reference frame that is not accelerating, where Newton's laws of motion hold true.
• Rotating Frame: A reference frame that is rotating, leading to the observation of the Coriolis effect.
• Deflection: The apparent change in direction of a moving object due to the Coriolis effect.
• Simulation: A computer-based model used to replicate real-world phenomena, allowing for manipulation of variables and observation of results.
• Trajectory: The curved path that a projectile takes in a rotating reference frame.

Sample Learning Goals

[text]

For Teachers

In physics, the Coriolis effect is a deflection of moving objects when they are viewed in a rotating reference frame. In a reference frame with clockwise rotation, the deflection is to the left of the motion of the object; in one with counter-clockwise rotation, the deflection is to the right.
The following simulation help you visualize the Coriolis effect in a 2D plane!

https://serc.carleton.edu/teachearth/activities/181248.html has paper worksheets for students to rotate by hand and when used with a small marble as the projectile, may be able to illustrate the concept.
Another good hands-on idea is to get one student to rotate real paper with the globe the North Pole showing to turn the paper anti-clockwise, another student to plot using a pen a straight line across from equator to North pole, the pen mark will actually be bent due to the rotating paper. 
Try this! It is surprisingly good for students and they will have a better chance of getting what the Coriolis Effect is.

Research

[text]

Video

https://www.youtube.com/watch?v=HIyBpi7B-dE  The Coriolis Effect Explained by Atlas Pro

 

https://www.youtube.com/watch?v=mPsLanVS1Q8   Coriolis Effect | National Geographic by National Geographic

 

https://www.youtube.com/watch?v=6L5UD240mCQ   The Coriolis Effect by What The Physics?!

 

https://youtu.be/mcPs_OdQOYU   coriolis effect (2-11) by samwsm1

 

https://www.youtube.com/watch?v=PDEcAxfSYaI  What is global circulation? | Part Three | The Coriolis effect & winds by Met Office - Learn About Weather

1. https://weelookang.blogspot.com/2019/02/coriolis-effect-2d-javascript.html
2. http://weelookang.blogspot.sg/2018/02/coriolis-effect-2d-javascript.html
3. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2770
   

Other Resources (Wikipedia use)

https://cosci.tw/run/?name=mT4kpy1554943857558 Section - take back pikachu b
This program simulates the movement of objects on the periphery of a rotating rotating platform, and the motion trajectory of this object is seen under different observation seats. In the simulation, there is a round table with the speed of speed w rotation, the little ji standing on the edge of the circle with a baby ball, Pikachu at the center of the round. After simulation execution (play play), when users can press the "launch" button, it will allow little ji to throw the baby ball in the hand to the Pikachu (Red Dotted Line Arrow) at the speed of the air, and you know that if little ji is aiming at the target Pikachu's direction throws the baby ball, can the baby ball successfully reach pikachu in front of it? The little kasumi standing on the ground (ground) saw the baby ball throwing the track as the baby ball trail standing on the stage of pikachu
Analog Link: https://cosci.tw/run/?name=mT4kpy1554943857558
Adjustable Parameters:
Observer Location: choose " Ground (inertial seat) " or " spin stage "
W: Rotating Terrace Velocity (W> 0 for counterclockwise rotation; W< 0 for clockwise rotation)
Tick Box:
Every second track: tick the track of every second after the baby ball throws
Inertia seat axis: when ticked, you show the inertia icon (Black Dotted Line Arrow) after the baby ball is thrown.
Button :----- Launch ----- click this button to empty the baby ball along the tight direction

Simulation Operation:
(1) play simulation by play
(2) Setting the set of adjustable parameters
The order of the two steps above is also exchanged.
(3) Press the "launch button" to throw the baby ball along the tight direction
(4) when the baby ball reaches the edge of the circle, it will jump in the box, and the simulation will be reset after closing the police box

FAQ: The Coriolis Effect

• What is the Coriolis Effect?
• The Coriolis Effect is the apparent deflection of moving objects when viewed from a rotating reference frame. This means that an object moving in a straight line appears to curve when observed from a rotating perspective. In a clockwise rotating frame, the deflection is to the left; in a counter-clockwise rotating frame, it's to the right.
• Why does the Coriolis Effect occur?
• The effect arises because different points on a rotating object have different velocities. An object moving radially outward from the center of rotation will appear to be deflected because its initial tangential velocity differs from the tangential velocity of the point it is approaching. It's important to understand that the object isn't actually being forced to curve, it's simply that its trajectory appears curved from the rotating frame.
• What is the significance of reference frames when understanding the Coriolis Effect?
• The Coriolis Effect is fundamentally tied to the observer's reference frame. An observer in an inertial (non-rotating) frame would see the object moving in a straight line (assuming no other forces are acting). However, an observer in a rotating frame would perceive a curved path due to the relative motion. Choosing the appropriate reference frame is crucial for accurately describing and predicting motion.
• Can you give a simple demonstration of the Coriolis Effect?
• One hands-on demonstration involves having a student rotate a piece of paper with a globe showing the North Pole anticlockwise. Another student uses a pen to draw a straight line from the equator to the North Pole. The line drawn will appear curved due to the rotation of the paper, illustrating the apparent deflection.
• How can simulations help visualize the Coriolis Effect?
• Simulations allow you to change parameters like rotation speed and observe the resulting trajectories of objects in both inertial and rotating reference frames. This interactive approach helps develop a stronger intuitive understanding of the concept. The document includes links to interactive simulations that allow you to manipulate these variables.
• What is the difference between observing the ball trajectory from the "Ground (inertial seat)" and "spin stage" in the simulation?
• Observing from the "Ground (inertial seat)" provides a view from a non-rotating, inertial frame of reference. In this view, the baby ball trajectory is close to a straight line if no other forces act on it. When you observe from the "spin stage", or the rotating frame, the baby ball path curves because of the Coriolis Effect.
• What adjustable parameters are available in the Coriolis Effect 2D JavaScript Simulation Applet HTML5? The adjustable parameters include:
• Observer Location: Choose "Ground (inertial seat)" or "spin stage" to change the observation perspective.
• W: Adjusts the velocity of the rotating terrace, with positive values indicating counterclockwise rotation and negative values indicating clockwise rotation.
• Tick Box: Allows toggling of visual aids, such as displaying the track of the baby ball every second after it is thrown and showing the inertia icon.
• Where can I find resources and simulations to further explore the Coriolis Effect?
• The provided document lists several useful resources, including links to interactive JavaScript simulations (such as the "Coriolis Effect 2D JavaScript Simulation Applet HTML5") and video explanations from sources like National Geographic and the Met Office. These resources offer both visual and interactive ways to learn more about the Coriolis Effect.