Thursday, July 30, 2015

Vernier caliper

Vernier caliper


Wednesday, July 29, 2015

EJSS vector sum model


Update 31 July 2015 now with examples by Ezzy Chan


Example 1 |V₁|=120,ϑ₁=60°,|V₂|=80,ϑ₂=105°

|V₁|=120,ϑ₁=60°,|V₂|=80,ϑ₂=105°
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre


|V₁|=120,ϑ₁=60°,|V₂|=80,ϑ₂=105°
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre

|V₁|=120,ϑ₁=60°,|V₂|=80,ϑ₂=115° example 1 by ezzy chan
|V₁|=120,ϑ₁=60°,|V₂|=80,ϑ₂=115° example 1 solution by ezzy chan

 Example 2 |V₁|=12,ϑ₁=0°,|V₂|=9,ϑ₂=90°

|V₁|=12,ϑ₁=0°,|V₂|=9,ϑ₂=90°
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre
|V₁|=12,ϑ₁=0°,|V₂|=9,ϑ₂=90°
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre




|V₁|=12,ϑ₁=0°,|V₂|=9,ϑ₂=90° solution by ezzy
|V₁|=12,ϑ₁=0°,|V₂|=9,ϑ₂=90° example by ezzy

Example 3 |V₁|=400,ϑ₁=-90°,|V₂|=500,ϑ₂=60°,|V₃|=500,ϑ₃=120°

|V₁|=400,ϑ₁=-90°,|V₂|=500,ϑ₂=60°,|V₃|=500,ϑ₃=120° example by ezzy
|V₁|=400,ϑ₁=-90°,|V₂|=500,ϑ₂=60°,|V₃|=500,ϑ₃=120° start
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre

|V₁|=400,ϑ₁=-90°,|V₂|=500,ϑ₂=60°,|V₃|=500,ϑ₃=120° example 3 end
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
examples from ezzy chan
author EJS: Francisco Esquembre

|V₁|=400,ϑ₁=-90°,|V₂|=500,ϑ₂=60°,|V₃|=500,ϑ₃=120° example 3 solution by ezzy


















EJSS vector sum model

Vector Sum Graphical Component
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
author EJS: Francisco Esquembre

Vector Sum Graphical Component style 1
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
author EJS: Francisco Esquembre

Vector Sum Graphical Component style 2
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
author EJS: Francisco Esquembre

Vector Sum Graphical Component style 3
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Fu-Kwun Hwang, lookang, tina
author EJS: Francisco Esquembre

Originally by 

Derived work by Wee Loo Kang under creative commons http://creativecommons.org/licenses/by/2.5/tw/deed.en

Licensed

You are free:
to Share — to copy, distribute and transmit the work
to Remix — to adapt the work

Under the following conditions:


Attribution. You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).

Attribute this work:

What does "Attribute this work" mean?
The page you came from contained embedded licensing metadata, including how the creator wishes to be attributed for re-use. You can use the HTML here to cite the work. Doing so will also include metadata on your page so that others can find the original work as well.
For any reuse or distribution, you must make clear to others the license terms of this work. The best way to do this is with a link to this web page.
Any of the above conditions can be waived if you get permission from the copyright holder.
Nothing in this license impairs or restricts the author's moral rights.         

reference:

http://weelookang.blogspot.sg/2010/06/add-two-vectors-to-determine-resultant.html

EJSS Standing Wave in Pipe Model

EJSS Standing Wave in Pipe Model
Standing Wave in Pipe Model Mode = 1
run: Link1Link2
download: Link1Link2
source: 
Link1Link2author: Juan M. Aguirregabiria, lookang, tina
author EJS: Francisco Esquembre

http://weelookang.blogspot.sg/2015/07/ejss-standing-wave-in-pipe-model.html
Standing Wave in Pipe Model Mode = 2
run: Link1, Link2
download: Link1, Link2
source: 
Link1, Link2author: Juan M. Aguirregabiria, lookang, tina
author EJS: Francisco Esquembre

Standing Wave in Pipe Model Mode = 3
run: Link1Link2
download: Link1Link2
source: 
Link1Link2author: Juan M. Aguirregabiria, lookang, tina
author EJS: Francisco Esquembre

Standing Wave in Pipe Model Mode = 4
run: Link1Link2
download: Link1Link2
source: 
Link1Link2author: Juan M. Aguirregabiria, lookang, tina
author EJS: Francisco Esquembre

Standing Wave in Pipe Model Mode = 5
run: Link1Link2
download: Link1Link2
source: 
Link1Link2author: Juan M. Aguirregabiria, lookang, tina
author EJS: Francisco Esquembre




Standing waves in a pipe


Let us consider a narrow pipe along the OX axis. Each end may be open or closed. The simulation will display the first 5 normal modes, which are
u(t,x) = A sin(n π x) cos(ω t + δ) when both ends are closed.
u(t,x) = A sin((n-1/2) π x) cos(ω t + δ) when the left end is closed and the right end open.
u(t,x) = A cos((n-1/2) π x) cos(ω t + δ) when the left end is open and the right end closed.
u(t,x) = A cos(n π x) cos(ω t + δ) when both ends are open.


Units are arbitrary
Below you may choose the mode n = 1, ...,5, for the various modes of standing wave formation closed endsas well as the animation step Δt.
The simulation shows the displacement field u(t,x) and the pressure p(t,x) as functions of x at each time t.
In the lower animation you may see the evolution of the position x + u(t,x) of several points and a contour plot of p(t,x) (lighter/darker blue means higher/lower pressure).
Optionally one can see the nodes where the displacement wave vanishes at all times.
Scale has been arbitrarily enhanced to make things visible; but keep in mind that we are considering very small displacements and pressure changes in a narrow pipe.
Put the mouse point over an element to get the corresponding tooltip.

Previous versions:

  1. http://weelookang.blogspot.sg/2015/07/ejss-standing-wave-in-pipe-model.html 
  2. http://weelookang.blogspot.sg/2012/01/ejs-open-source-standing-wave-in-fixed.html 

Activities

  1. Compute the position of the nodes for mode number n in the four considered cases. 
  2. Use the simulation to check your calculation. 
  3. Where are the pressure nodes in the different cases? 
  4. Which is the relationship between the displacement and pressure waves? How does it appears in the animation?
 

Authors:

This is an remixed by lookang and tina, of the English translation of the Basque original for a course on mechanics, oscillations and waves.
It requires Java 1.5 or newer  is written now in Javascript and was created by Juan M. Aguirregabiria with Easy JavaScript Simulations (Ejss) by Francisco Esquembre. We all thank Wolfgang Christian and Francisco Esquembre for their help.

Tuesday, July 28, 2015

Research gate part3

18 august part5
Law of inertia at work. What is most downloaded remains most downloaded past 5 weeks!



04 august 2015 part4



Law of inertia at work. What is most downloaded remains most downloaded this week!

Vernier caliper and micrometer computer models using Easy Java Simulation

Thank you Physics Education
i also submitted to https://www.ictlt.com/
http://ictlt2016.exordo.com/#submissions/all/23/view

Title
Vernier caliper and micrometer computer models using Easy Java Simulation and its pedagogical design feature-ideas to augment learning with real instruments
Authors
  1. Mr. Lawrence WEE (Ministry of Education, Singapore)
Abstract
This article presents the customization of EJS models, used together with actual laboratory instruments, to create an active experiential learning of measurements. The laboratory instruments are the vernier caliper and the micrometer. Three computer model design ideas that complement real equipment are discussed in this article. They are 1) the simple view and associated learning to pen and paper question and the real world, 2) hints, answers, different options of scales and inclusion of zero error and 3) assessment for learning feedback. The initial positive feedback from Singaporean students and educators points to the possibility of these tools being successfully shared and implemented in learning communities, and validated.
Educators are encouraged to change the source codes of these computer models to suit their own purposes, licensed creative commons attribution for the benefit of all humankind.
Video abstract: http://youtu.be/jHoA5M-_1R4
Topic Areas
  • Checked
    Sciences
Main Presenter Author Contact Number
92475573
Designation
Specialist
Alternate Email Address
weelookang@gmail.com
Conference Strand
Connecting Educators as Learning Designers
Target Audience
Teacher-Leaders (e.g. Senior / Lead / Master Teachers, Heads of Departments, School Staff Developers, and ICT Mentors)
Target Audience (Secondary)
Teacher-Leaders (e.g. Senior / Lead / Master Teachers, Heads of Departments, School Staff Developers, and ICT Mentors)

History of Presentation
No
Presentation Format
E-Poster Exhibition
Submission Date
July 25, 2015 18:33
Is It a Student Paper?
No
Latest Update
July 25, 2015 19:50
Submission ID
23




Understanding resonance graphs using Easy Java Simulations (EJS) and why...

Thank you Physics Education
i also submitted to https://www.ictlt.com/
http://ictlt2016.exordo.com/#submissions/22/
Title
Vernier caliper and micrometer computer models using Easy Java Simulation and its pedagogical design feature-ideas to augment learning with real instruments
Authors
  1. Mr. Lawrence WEE (Ministry of Education, Singapore)
Abstract
This article presents the customization of EJS models, used together with actual laboratory instruments, to create an active experiential learning of measurements. The laboratory instruments are the vernier caliper and the micrometer. Three computer model design ideas that complement real equipment are discussed in this article. They are 1) the simple view and associated learning to pen and paper question and the real world, 2) hints, answers, different options of scales and inclusion of zero error and 3) assessment for learning feedback. The initial positive feedback from Singaporean students and educators points to the possibility of these tools being successfully shared and implemented in learning communities, and validated.
Educators are encouraged to change the source codes of these computer models to suit their own purposes, licensed creative commons attribution for the benefit of all humankind.
Video abstract: http://youtu.be/jHoA5M-_1R4
Topic Areas
  • Checked
    Sciences
Main Presenter Author Contact Number
92475573
Designation
Specialist
Alternate Email Address
weelookang@gmail.com
Conference Strand
Connecting Educators as Learning Designers
Target Audience
Teacher-Leaders (e.g. Senior / Lead / Master Teachers, Heads of Departments, School Staff Developers, and ICT Mentors)
Target Audience (Secondary)
Teacher-Leaders (e.g. Senior / Lead / Master Teachers, Heads of Departments, School Staff Developers, and ICT Mentors)
History of Presentation
No
Presentation Format
E-Poster Exhibition
Submission Date
July 25, 2015 18:33
Is It a Student Paper?
No
Latest Update
July 25, 2015 19:50
Submission ID
23



Monday, July 27, 2015

EJSS Fermat's principle refraction model

In optics, Fermat's principle or the principle of least time is the principle that the path taken between two points by a ray of light is the path that can be traversed in the least time.

EJSS Fermat's principle refraction model

http://weelookang.blogspot.sg/2015/07/ejss-fermats-principle-refraction-model.html
run: Link1, Link2
download: Link1, Link2
source: Link1, Link2
author: Fu-Kwun Hwang, lookang, tina
author EJSS: author EJS: Francisco Esquembre


If possible, let as many know that we can harness the power of OSP for the benefit of all, licensed creative commons attribution, not all rights reserved, just the rights to be named in the our remixed derivatives will suffice.
Our purpose to help the world at our otherwise untapped intellectual cost, a small price we can pay for the greater good of all educational system in the world.

Saturday, July 25, 2015

E posters for http://ictlt.com

The system ex ordo is quite good.

Some areas of improvement are.
Remember submissions emails, designations, head of school name and emails alternate emails.
Shows eposter file name after submission.

Friday, July 24, 2015

2010 Eurovision winner: “Satellite”

2010 Eurovision winner: “Satellite”

http://ioppublishing.org/newsDetails/read-the-iop-eurovision-collection-2015


Read the paper: A geostationary Earth orbit satellite model using Easy Java Simulation

Loo Kang Wee and Giam Hwee Goh 2013 Phys. Educ. 48 72

http://iopscience.iop.org/0031-9120/48/1/72/article


Researchgate part2

Most views of the week. Who would have guess it only takes 27 views?

Thursday, July 23, 2015

EJSS Transverse Wave Model

EJSS Transverse Wave Model

http://weelookang.blogspot.sg/2015/07/ejss-transverse-wave-model.html
Run: Link1, Link2
Download: Link1, Link2
source: Link1, Link2
author: Tat Leong, lookang
author EJS: Francisco Esquembre

Run: Link1Link2
Download: Link1Link2
source: Link1Link2
author: Tat Leong, lookang
author EJS: Francisco Esquembre

Monday, July 20, 2015

Monday, July 13, 2015

ground breaking news! I have developed fullscreen capability for EJSS

ground breaking news! I have developed a way to launch full-screen capability for EJSS. It now looks like a web-app.

in my testing, it works beautifully on SumSung Note 3 5.5 inch screen in portrait orientation.

http://weelookang.blogspot.sg/2015/07/ground-breaking-news-i-have-developed.html
launch in Note3 5.5 inch screen
run: Link1 , Link2
download and unzip: Link1 , Link2
source: Link1, Link2
author: Fu-Kwun Hwang, lookang
Author of EJSS authoring tool: Francisco Esquembre
http://weelookang.blogspot.sg/2015/07/ground-breaking-news-i-have-developed.html
launch in Note3 5.5 inch screen after clicking the FULLSCREEN buttonrun: Link1 , Link2
download and unzip: Link1 , Link2
source: Link1Link2
author: Fu-Kwun Hwang, lookang
Author of EJSS authoring tool: Francisco Esquembre

Friday, July 10, 2015

iCTLT 2016 – Online Submission Chair and User Guide

i am conference chair, need to watch these video. Pretty immpressive system http://www.exordo.com/
iCTLT 2016 – Online Submission Guide
2016, 28-31 March
5th International Conference on Teaching and Learning with Technology
http://ictlt2016.exordo.com
  1. Overview: https://www.youtube.com/watch?v=OSRDBpz5BZQ
  2. Setting up initial conference: https://www.youtube.com/watch?v=xmw7ABhzLIs
  3. Setting up Abstract & paper submission: https://www.youtube.com/watch?v=pj8EXiK1J5s
  4. Setting up the Peer Review Marking Scheme: https://www.youtube.com/watch?v=HxmVKXiRJNw
(Note: These are basic marketing videos which might not “cover” some new features or
customization)

Tuesday, July 7, 2015

Greetings from Brazil! Thank you

Thanks to professor in Brazil for the email for affirming my contribution to use of technology for physics education.

Thursday, July 2, 2015

EJSS Micrometer Model

successfully re -created on Easy JavaScript Simulation EJSS!
can you read the reading of the Micrometer?
EJSS Micrometer Model
http://weelookang.blogspot.sg/2015/07/ejss-micrometer-model.html
run: Link1 , Link2
download: Link1, Link2
source: Link1, Link2

with hints, it is easy! what is 7.0 mm main scale and 0.87 mm on micrometer scale added together?
run: Link1 , Link2
download: Link1Link2
source: Link1Link2

check on the answers to see whether you got the answer correct. yes, it is 7.87 mm
run: Link1 , Link2
download: Link1Link2
source: Link1Link2

what if there were zero errors of +0.10 mm? the answer is 7.0 +0.97 - (0.10) = 7.87 mm
run: Link1 , Link2
download: Link1Link2
source: Link1Link2

what if there were zero errors of -15 mm? the answer is 7.0 +0.72 - (-0.15) = 7.87 mm
run: Link1 , Link2
download: Link1Link2
source: Link1Link2

Micrometer Model


Micrometers use the principle of a screw to amplify small distances that are too small to measure directly into large rotations of the screw that are big enough to read from a scale. The accuracy of a micrometer derives from the accuracy of the thread form that is at its heart. The basic operating principles of a micrometer are as follows:
The amount of rotation of an accurately made screw can be directly and precisely correlated to a certain amount of axial movement (and vice-versa), through the constant known as the screw's lead. A screw's lead is the distance it moves forward axially with one complete turn (360°). (In most threads [that is, in all single-start threads], lead and pitch refer to essentially the same concept.)
With an appropriate lead and major diameter of the screw, a given amount of axial movement will be amplified in the resulting circumferential movement.

The micrometer has most functional physical parts of a real micrometer.


Frame (Orange) The C-shaped body that holds the anvil and barrel in constant relation to each other. It is thick because it needs to minimize expansion, and contraction, which would distort the measurement. The frame is heavy and consequently has a high thermal mass, to prevent substantial heating up by the holding hand/fingers. has a text 0.01 mm for smallest division of instrument has a text 2 rounds = 100 = 1.00 mm to allow association to actual micrometer
Anvil (Gray) The shiny part that the spindle moves toward, and that the sample rests against.
Sleeve / barrel / stock (Yellow) The stationary round part with the linear scale on it. Sometimes vernier markings.
Lock nut / lock-ring / thimble lock (Blue) The knurled part (or lever) that one can tighten to hold the spindle stationary, such as when momentarily holding a measurement.
Screw (not seen) The heart of the micrometer It is inside the barrel.
Spindle (Dark Green) The shiny cylindrical part that the thimble causes to move toward the anvil.
Thimble (Green) The part that one's thumb turns. Graduated markings.
Ratchet (Teal) (not shown ) Device on end of handle that limits applied pressure by slipping at a calibrated torque.

Reference: