Saturday, April 23, 2011

Open Source Physics Simulations by lookang

Open Source Physics Simulations in APA style citation.
Have made so many still not submitted to OSP http://www.compadre.org/osp/index.cfm , if you want them go to NTNUJAVA Virtual Physics Laboratory http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=28.0 

WEE, L.K., & Esquembre, F. (2010). Lorentz force on a current carrying wire java applet [Computer software]. Retrieved April 23, 2011, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10543&DocID=2053
Hwang, F.K., & WEE, L.K. (2010). Cyclotron in 3D Model (Version 10/12/2010) [Computer software]. Retrieved April 23, 2011, from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2021.0
Hwang, F.K., WEE, L.K. & Christian, W (2009). Vernier Caliper Model [Computer software]. Retrieved April 23, 2011, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9707&DocID=1445
Hwang, F.K., WEE, L.K. & Christian, W (2009). Micrometer Model [Computer software]. Retrieved April 23, 2011, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9422&DocID=1315
Hwang, F.K. & WEE, L.K (2009). Blackbody Radiation Spectrum Model [Computer software]. Retrieved April 23, 2011, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9387&DocID=1292

Thursday, April 21, 2011

For Physics teachers who ask me for resources and research


talking about physics tools






I have a blog with a menu of the left that is for physics in sg syllabus context.
let say u want this
just follow the applet link hosted in NTNUJAVA Virtual Physics Laboratory by Professor Fu-Kwun Hwang from Taiwan http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1940msg7108;topicseen#msg7108
register and download it.
the license is creative commons attribution.


alternatively, go direct to http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=28.0
Collaborative Community of EJS (Moderator: lookang) and register , login and download all of them for free :)
You should also look at Professor Fu-Kwun Hwang's collection of Ejs applet, the are fantastic too.
http://www.phy.ntnu.edu.tw/ntnujava/index.php


You can follow my blog, follow me on Twitter, follow me on Facebook to get news of my latest creations remixing from the world's best Ejs physicists educators. 



in addition, it will interest you to know tracker
I being going to schools to 'scale' meaningful technology in physics learning, u might want to try this mode of collaboration between HQ and school.
It is currently positioned as a personal project instead of an ETD project, so I can only assure you that students will learn better and have fun, it is very hands-on, so far 4 schools have tried tracker about of me.
read this so that you understand I need to publish your lesson here for 'spreading' of good lessons using technology for self directed and collaborative learning (SDL n CoL). u interested just let me know :)
if you are interested in MOE-ETD produced resources,
ALL my 14 Physics Videos Collaboration with NUS Physics Associate Professor Sow Chorng Haur.
they are best rated resources in edumall until today still available, better than discovery channel video that has taken down due to end of licensing agreement.
pls download the video and host them in your LMS.
ALL my Flash Based Interactives Simulations & Animations & Pictures
mostly primary school stuff
pls download the video and host them in your LMS if you want.

Wednesday, April 20, 2011

Ejs Open Source Wave Representations Model Java Applet Simulation « on: Today at 12:00:34 am »

updated 1 august 2015
amplitude of wave = 0.20 m, maximum displacement from equilibrium position
run: Link1Link2
download: Link1Link2
source: 
Link1Link2
author: Andrew Duffy, lookang, tina
author EJS: Francisco Esquembre


Ejs Open Source Wave Representations Model Java Applet Simulation
« on: Today at 12:00:34 am »
http://weelookang.blogspot.sg/2011/04/ejs-open-source-wave-representations.html
Ejs Open Source Wave Representations Model Java Applet Simulation 

https://dl.dropboxusercontent.com/u/44365627/lookangEJSS/export/ejs_model_Wave_representations_v5.jar
https://dl.dropbox.com/u/44365627/lookangEJSworkspace/export/ejs_users_sgeducation_lookang_Wave_representations_v5.jar
author: Andrew Duffy, remixed by lookang

Ejs Open Source Wave Representations Model Java Applet Simulation by Andrew Duffy, remixed by lookang


simulation applet hosted by NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2178.0

http://www.compadre.org/osp/items/detail.cfm?ID=7618&S=2
The Ejs Wave Representations model displays two representations of a sinusoidal wave on a string. One shows a movie of the wave traveling along a string - you can think of this representation as a sequence of photographs. The second representation is a plot of the displacement as a function of time for two points on the string (you can select which two points to use). Using only these two representations, you can determine the values of many different parameters that describe the wave. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.


Wave representations by Andrew Duffy
In this simulation, you have two representations of wave motion to work with. One shows a movie of the wave traveling along a string - you can think of this representation as a sequence of photographs. The second representation is a plot of the displacement as a function of time for two points on the string (you can select which two points to use). Using only these two representations, you can determine the values of many different parameters that describe the wave.

Activities by Andrew Duffy
Keep pressing the "Get a new wave" button until you have a wave you are happy with. Then, play the simulation until you have a nice position versus time graph. Then, pause the simulation so that you have a photograph of the string as well as your position vs. time graph to work with. For each parameter below, figure out which of the two representations you need to determine the value of the parameter, and then find the value. You can check your answers as many times as you want.
The amplitude.
The wavelength.
The period.
The angular frequency.
The wave speed.
The maximum transverse speed of a single point on the string.
and now!! frequency // remix by lookang
and Phase lead of blue point x1 to green point x2 // remix by lookang

changes made:
fixed the " with ' which is giving some error message in Ejs 4.3.3
re arrange to usual layout and color scheme
made the 2 x1 and x2 points drag-gable to improve usability
made feedback immediate, improve user experience
added frequency = 1/T
added phase lead of x1 to x2 = (xval2-xval)/lambda*2*Math.PI;



work in progress
done!
enjoy!

suggested answers methods
screenshot of possible way to solve this great simulation by Andrew Duffy, remixd by lookang!  

some definitions by http://miniphysics.blogspot.com/2011/01/properties-of-waves.html

Amplitude
Amplitude is the maximum displacement from the rest or central position, in either directions.

SI unit is metre
Scalar quantity
Frequency

Frequency (f) is defined as the number of complete waves produced per unit time.
SI unit is hertz (Hz) - 1 Hz = 1 complete cycle per second
Scalar quantity
Determined by the source (for water waves)

Wavelength

Wavelength (λ) is the distance between corresponding points of two consecutive waves.
SI unit is metre
Scalar quantity
Speed

Speed of the wave propagation is defined as the distance travelled by a wave per unit time.
SI unit is metre per second (m s-1)
Scalar quantity
Period

Period (T) is defined as the time taken to produce one complete wave.
SI unit is second (s)
Scalar quantity
T = 1/f
Velocity

Velocity is the distance travelled by a wave in one second.
SI unit is metres per second (m s-1)
Vector quantity
v = fλ

Monday, April 18, 2011

Ejs Open Source Resistor Inductor Capacitor Alternating Current Model

Ejs Open Source Resistor Inductor Capacitor Alternating Current Model
http://weelookang.blogspot.sg/2011/04/ejs-open-source-resistor-inductor.html
Ejs Open Source Resistor Inductor Capacitor Alternating Current Model
author: fu-kwun hwang and lookang
https://dl.dropboxusercontent.com/u/44365627/lookangEJSS/export/ejs_model_RLC.jar
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejs_users_sgeducation_lookang_RLC.jar

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2177.0
Ejs Open Source RLC AC Model java applet
Ejs Open Source Resistor Inductor Capacitor Alternating Current Model java applet by Fu-Kwun Hwang, slightly edited by lookang
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=368.0
text by Fu-Kwun Hwang
The code has been modified so that you can remove one or two elements.
Now you can study pure resistor circuit, RC, RL, LC or RLC circuit with this simulation.
I also add small circle along the circuit loop to simulate the average motion of charge particle in the loop.
The current flow I in the loop in proportional to (in phase) the voltage of the resistor VR.
However, there is a 90 degree out of phase between voltage of inductor/capacitor and the current I.
The slider bar on the left is used to adjust the voltage of the source. V

Text from Wolfgang Christian http://www.compadre.org/OSP/document/ServeFile.cfm?ID=9469&DocID=1338
       The RLC Circuit with AC Generator model simulates a resistor R, a capacitor C, and an inductor L in series with either a sinusoidal wave source voltage V(t) and plots the time dependence of the voltage drops across the source V(t), the resistor V_R(t), the inductor V_L(t)and the capacitor V_C(t). The differential equation for the charge on the capacitor Q can be found by applying Kirchhoff's loop rule.  


L d2Q/dt + R dQ/dt + Q/C = V(t)


       Exercises:

  1. Run the model and observe what happens as you change the frequency, inductance (L), resistance (R) and capacitance (C). The plot shows the source voltage (gray) as well as the voltages across each circuit element (color coded to the the input boxes at the top of the window).
  2. Pick a specific point in time and measure each of the voltages and verify that the voltage across the inductor (green), resistor (blue) plus capacitor (red) do indeed equal the value of the source voltage (black).
  3. Consider the square wave simulation.  Describe what happens to the voltage across each element when the voltage source switches.  Explain why that happens. not available in this model yet.
  4. Now run the simulation with a sinusoidal voltage source. The resonant frequency of this circuit is given by ωo=(LC)-1/2.  where  ω=2πf. Change the frequency to the resonant frequency.  Pick different values of L and C and observe what happens at the new resonant frequency. Specifically, how does the resistor voltage compare with the source voltage? Explain.

References:

  • Robert A. Morse, "Conceptualizing ideal circuit elements in the AP Physics C syllabus," The Physics Teacher 43 (8), pages 540-543 (2005)
  • Yaakov Kraftmakher, "Demonstrations with an LCR Circuit," The Physics Teacher, 49(3) pages 168-170 (2011).         





http://upload.wikimedia.org/wikipedia/en/thumb/9/9f/RLC_series.png/350px-RLC_series.png
from http://en.wikipedia.org/wiki/RLC_circuit
An RLC circuit (or LCR circuit) is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel. The RLC part of the name is due to those letters being the usual electrical symbols for resistance, inductance and capacitance respectively. The circuit forms a harmonic oscillator for current and will resonate in just the same way as an LC circuit will. The difference that the presence of the resistor makes is that any oscillation induced in the circuit will die away over time if it not kept going by a source. This effect of the resistor is called damping. Some resistance is unavoidable in real circuits, even if a resistor is not specifically included as a component. A pure LC circuit is an ideal which really only exists in theory.
There are many applications for this circuit. They are used in many different types of oscillator circuit. Another important application is for tuning, such as in radio receivers or television sets, where they are used to select a narrow range of frequencies from the ambient radio waves. In this role the circuit is often referred to as a tuned circuit. An RLC circuit can be used as a band-pass filter or a band-stop filter. The tuning application, for instance, is an example of band-pass filtering. The RLC filter is described as a second-order circuit, meaning that any voltage or current in the circuit can be described by a second-order differential equation in circuit analysis.
The three circuit elements can be combined in a number of different topologies. All three elements in series or all three elements in parallel are the simplest in concept and the most straightforward to analyse. There are, however, other arrangements, some with practical importance in real circuits. One issue often encountered is the need to take into account inductor resistance. Inductors are typically constructed from coils of wire, the resistance of which is not usually desirable, but it often has a significant effect on the circuit


 RLC circuit

RC circuit

RL circuit


LC circuit

 C circuit

 L circuit




R circuit

Number of Compliments for Service Award 2011












Who has complimented me in April 2010 to March 2011? After going through emails and memory recall, did manage to find 6? Are they good examples for service excellence render by me?

1
Aw Wai Lin Alice, Principal Master Teacher attended my sharing of the outcomes and research of the electronic Professional Learning Community that she and Master Teacher Teh-Yau Li Heong thanks us
and decides to invite us again to share with 1. science subject chapter committee to develop teacher leadership for professional excellence and seek inputs for grounds-up initiatives, 2. West Zone COE/Science and Technology seminar with the Master teachers. The outstanding service is the use of sharable gooole sites that any schools can use the approach of professional learning immediately benefiting school leaders and teachers exploring ways to improve the quality of professional learning among teachers.

2
Sin Kim Ho, Deputy Director Science Branch CPDD compliments on the great work reaching out the Physics community during 3rd Physics Instructional Programme Support Group Sharing at ACJC 19 Jan 2011 and and well as through edumall subject forum and my Blog weelookang.blogspot.com. The outstanding service is the high quality of Physics technology tools shared are available through Global community of Physicists and freely downloadable, immediately benefiting teachers in schools.

3
Zhang Baohui, Assistant Professor at Learning science Lab at NIE and his colleague Karel complimented the high quality of help to improve their design of learning of their own Project by using simulations and other tools to be embedded within their Project intervention framework.The outstanding service is the high quality Physics technology tools shared are available through Global community of Physicists and immediately can be of use to the School of Science and Technology teachers and students in their school.

4
Chow Chiu Wai, HOD ICT from Hwa Chong Institution (HCI)compliments on the 'strong support' to help him and his 4 other physics teachers to design and create videos and worksheets for learning by guided inquiry approach. This is Chiu Wai's own initiative to scale this tool in HCI after attending my International Science Teachers Conference Workshop @ Science Centre is testimonial to the service provided by Loo Kang from MOEHQ-ETD as teachers come back to seek his service and specialization..

5
Jimmy Goh, HOD Sc from Yishun Junior College (YJC) compliments on the service provided to him and his 6 physics teachers in scaling the use of the ICT tool for a 200+ students level wide lesson in a recent practical lab. This is Jimmy's own initiative to scale this tool in YJC after attending my International Science Teachers Conference Workshop @ Science Centre is testimonial to the service provided by Loo Kang from MOEHQ-ETD as teachers come back to seek his service and specialization.

6
Chan Lai Peng, Deputy Director Technologies & Design for Learning Branch ETD compliments on the great work in representing ETD in the new Academy of Singapore Teachers (AST) Physics Task Force Committee. Being invited by AST to review and recommend frameworks to integrate technology as well as develop 2 lesson exemplars to be shared with teachers through subject chapters of AST. To quote Ms Chan my 'contributions will be fully appreciated by the teachers" is indeed realized through the task force outreach activities as many teachers are using the exemplars when the opportunity arises.


Contributions to service improvement
In an ETD-MOE website called ICT Connection portal, teachers can post up their meaningful use of technology lessons. To continually improve the ETD service to schools teachers, we implemented 2 enhancements mentioned here among many others.
1 To increase the search-ability and visibility of good lessons, we implemented a new function that automatically pumps the comments made by teachers into a discussion forum within ICT Connection where more teachers visit because of the face to face sessions conducted by ETD. This increases the visibility of a more vibrant teacher community in edumall.sg and teachers may find good examples more easily than before through our website ICT Connection.
2 To increase the participation from teachers to contribute lesson ideas and even just any information that is useful to relate to existing lessons already in ICT Connection, a new function is implemented to allow teachers to upload resources they create for example worksheet, URL, simulations etc as add-on parts to lesson examples. This opportunity allows teachers who may be too busy to post new lesson examples but would like to contribute their smaller resources to add value to other teachers’ lessons, sharing and learning in edumall.sg. This we hope is part of a larger goal and that is to make teachers feel more part of a larger community of educators using ICT connection and surface others teachers who could be networked for this noble mission to teach.
Lastly, special service (see compliments 4 & 5) to teachers is provided by Loo Kang in terms of going to schools to conduct workshops and co-teach on the use of Physics tools such as Tracker and creating simulations for student inquiry learning. Loo Kang also hand hold the teachers in the lesson itself by co-teaching in the technology lessons which some teachers could be uncomfortable using technology. All these support service and outreach initiative are Loo Kang's own as he believes in helping other teachers to support student centered activities as means to get students to be self directed and have fun learning. This special service is beyond his current job scope as defined by MOE.

Thursday, April 14, 2011

I am on Academy of Singapore Teachers > Professional Networks > Subject Chapters > Science Subject Chapter > Physics

I am on Academy of Singapore Teachers >; Professional Networks >; Subject Chapters >; Science Subject Chapter >; Physics
the pictures are from a recent event http://weelookang.blogspot.com/2010/10/3rd-physics-instructional-programme.html for more details as well as the simulation shared.

Charles Chew, Wee, L. K, Tsoi M.F., Tan K.C. (2011, 19 January) presentation on Branded Blended Learning (BBL): The TSOI Model for Electromagnetic Induction & its applications, Anglo-Chinese Junior College, Singapore

http://www.academyofsingaporeteachers.moe.gov.sg/cos/o.x?c=/ast/pagetree&func=view&rid=1072655


JC Physics IPSG Sharing on Branded Blended Learning at ACJC on 19 Jan 2011


JC IPSG Annual Gathering at ACJC for all JC Physics Trs (19 Jan 2011)
JC IPSG Concurrent Sessions for Teacher-Led Professional Sharings

Physics Task Force Sharing on Branded Blended Learning (BBL)

Dr Tan Kah Chye (Addest Technovation) & Dr Charles Chew (Academy)

Physics Task Force Members on TSOI Model of BBL.
(L to R) Dr Raymond Tsoi, Dr Tan Kah Chye, Dr Charles Chew, Mr Wee Loo Kang
Dr Raymond Tsoi (NIE) on Hybrid Learning Model


Customized AC Generator Model by Dr Tan
Mr Wee Loo Kang (ETD) on Customised Online Simulations

Tuesday, April 12, 2011

Videos determine the Moon's g using Tracker and The Apollo 15 Hammer-Feather Drop video large version

Videos determine the Moon's g using Tracker and The Apollo 15 Hammer-Feather Drop video large version

was reading http://iopscience.iop.org/0031-9120/46/1/F01 by J R Persson and J E Hagen


video: ftp://nssdcftp.gsfc.nasa.gov/miscellaneous/planetary/apollo/AS15_Ham_feath_drop3.mov

decided to try it out myself.
if the assumption of the man in space suit is 2.0 m, the value of g on moon is roughly 1.6 to 2.0 m/s^2 from my analysis.

this activity is indeed becoming scientist!
something i thought that could be shared as one of the feedback in YJC tracker scaling, the comment was "he or she or the group did not feel they are thinking like scientist".




Friday, April 8, 2011

Schools still not using technology effectively? Check out tracker scaling efforts since Nov 2009 until present March 2011

A recent photo at YJC using tracker in PWS5 2011 March

An a more positive note on using technology effectively, let's look at the efforts of ordinary teachers in schools rather than focus on high technology use as in some schools?  http://www.todayonline.com/singapore/EDC110407-0000418/Schools-still-not-using-technology-effectively


Schools still not using technology effectively? Check out tracker scaling efforts since Nov 2009 until present March 2011


Informal tracker http://www.cabrillo.edu/~dbrown/tracker/ scaling efforts since Nov 2009 until present

1.     Lead in the co-design and implementation of tracker lesson example with River Valley high School (Lee, Wee, Cheng, & Tan, 2010) with favorable feedback from the 5 teachers and 214 students involved and also conducted numerous workshops and presentations to scale use of Tracker as meaningful use of ICT as listed below.
1.      ICT mentor sharing secondary science on video analysis using Tracker held at Queensway Secondary School, Singapore by Wee, L.K., Samuel Tan (2010, 14 May)
2.      ICT mentor sharing secondary science on video analysis using Tracker held at River Valley High School, Singapore by Wee, L.K., Samuel Tan (2010, 20 May)
3.      eduLab mass briefing on possible ideation options for eduLab projects sharing on Easy Java Simulation and Tracker, Jurong Junior College, Singapore, eduLab mass briefing by Wee, L. K. (2010, 03 November) 
4.      Workshop Concurrent 4.9 Workshop - Innovation in Science Education Open Source Physics – Tracker Video Analysis and Modeling Tool, Singapore Science Center, Singapore 1st Science Teacher Conference by Wee, L. K., Lee T.L. & Charles Chew (2010, 23-24 November)
5.      Workshop on Learning Physics of Sport Science through Video Analysis and Modeling, Anglo-Chinese Junior College, Singapore by Lee T.L., Wee, L. K. (2011, 19 January)
6.      Workshop on Learning Physics of Sport Science through Video Analysis and Modeling, 4th Redesigning Pedagogy conference National Institute of Education, Nanyang Technological University,  Singapore by Lee T.L., Wee, L. K. (2011, 31 May to 03 June) accepted session

2.       As a result, several teachers from different schools have contacted Loo Kang since, sharing back remixed lessons using Tracker derived from the our first River Valley High School lesson example. The school are including RVHS:
1.      River Valley High School by Lee Tat Leong HODICT ( 4 teachers, level wide 214 JC1 students, project based 4 week lesson) http://weelookang.blogspot.com/2010/03/learning-physics-through-video-analysis.html
2.      Nanyang Girls High by Ang Joo Liak (SnrTeacher) ( 1 teacher, his sec 2 students, physics Olympiad project based 4 week)
3.      Hwa Chong Institution by  Chow Chiu Wai (Dir/Global Network & EdTech) (4 teachers, only their JC1, 1.5 hour lesson) http://weelookang.blogspot.com/2011/02/ball-throw-vertically-up-video-analysis.html they implemented another lesson instead of this one which they initially discussed with me
4.      Yishun Junior College by Jimmy Goh HODSc (6 teachers, level wide JC1 students, 1.5 hour lesson). http://weelookang.blogspot.com/2011/03/tracker-scaling-in-yishun-junior.html 

Monday, April 4, 2011

Blog Directory – Your Submission Has Been Added | Edublogs - education blogs for teachers, students and institutions

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my own screenshot of http://weelookang.blogspot.com/


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