Ejs open source kinematics java applet displacement velocity acceleration graphs

[lookang]

http://home.phy.ntnu.edu.tw/~lookang/EJS_4.1_090115/weexvav17rebuild_Simulation.html

Ejs open source kinematics java applet displacement velocity acceleration graphs
Kinematics of 1 D uniformly accelerated motion


run on 3.47
good reference:
http://www.ngsir.netfirms.com/englishhtm/Kinematics.htm

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=186.0
a good source


seems to make duplicate posts of the same java applet http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=710.msg2578#msg2578

Embed a running copy of this simulation
<applet code='users.sgeducation.lookang.Kinematics_pkg.KinematicsApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/14019/ejs_Kinematics.jar' name='Kinematics2528' id='Kinematics2528' width='600' height='550' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=2528' target='smfejs'>Run simulation</a>

Full screen applet or Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.

Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

[lookang]

working on this

[lookang]

Ejs open source java applet for increasing decreasing displacement at increasing decreasing rates.
Ejs open source kinematics java applet displacement velocity acceleration graphs
Kinematics
Illustrate increasing/decreasing displacement at increasing/decreasing rates.
http://home.phy.ntnu.edu.tw/~lookang/EJS/ejs_group.files/weexvav12.app/weexvav12.html
reference:
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=186.0

[lookang]

Designed by Fu-Kwun Hwang http://www.phy.ntnu.edu.tw/ntnujava/ Original Source code by Fu-Kwun Hwang http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=186.0 Derived work by Wee Loo Kang under creative commons http://creativecommons.org/licenses/by/2.5/tw/deed.en

Kinematics is the science of describing the motion of objects using words, diagrams, numbers, graphs, and equations. The goal of any study of kinematics is to develop sophisticated mental models which serve to describe (and ultimately, explain) the motion of real-world objects. This applet has a real world side view on an object (grey circle) at the top with physical quantities like Displacement, Velocity and Acceleration. (color coded for ease of association). The middle has 3 graphs each showing real time relationship from left to right, they are:
1. Motion with Displacement vs. Time Graph
hints:
Meaning of Shape of D-t Graph
Meaning of Slope of D-t Graph
2. Motion with Velocity vs. Time Graph
hints:
Meaning of Shape of v-t Graph
Meaning of Slope of v-t Graph
Meaning of Area on a v-t Graph
3. Motion with Acceleration vs. Time Graph
hints:
Meaning of Shape of a-t Graph
Meaning of Area on a a-t Graph

Notice that there are scaffolds text to describe the motion instantaneously for learning of physics of motion, to heighten the support to learners to understand the relational meaning of the 3 graphs.
All the graphs are dynamically calculated using equations of motion dx/dt = v and dv/dt = a. (refer to the Model - Evolution Page & Custom Function getV for the details of implementation of the moving points on the v-t graph) It also has a dropdown menu bar for common motions to support ease of exploration and sense making of words to the motion it describes for high school or secondary school learners.
at_rest;
uniform_motion_=_10;
uniform_motion_=_20;
uniform_motion_=_-10;
uniform_motion_=_-20;
simple_acceleration;
simple_deceleration;
negative_acceleration;
positive_deceleration;
edit_v-t_graph"

The slow checkbox allows for slowing down the simulation for higher velocities examples.

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Previously
A script on the page "Illustrate increasing/decreasing displacement at increasing/decreasing rates." (http://www.phy.ntnu.edu.tw/ntnujava/index.php?PHPSESSID=92b971004d55f1f0a04d1efc0a9f2d17&topic=710.msg2589#new) is making Safari unresponsive. Do you want to continue running the script, or stop it?

what is wrong?

Mac OSX cannot load failed
Windows XP can load properly

strange? any thoughts?

need time to figure out why


source code
download the *.jar for using the applet on standalone without internet connection.

[Fu-Kwun Hwang]

I was not able to view the applet you have posted (the first message). May be that is the reason why the Safari did not response.

There might be other reason to cause browser unresponsive. e.g.
If I viewed java applet with Firefox 2 with JDK 1.6.0_06 , the browser will hangup (when java embed in the html).
You can find out similar report at http://forum.java.sun.com/thread.jspa?messageID=10221200

Now,  I switch to Foreox 3 and install latest JDK1.6.0_07 and it work just fine when I view other topic.
May be you can try to update to latest java run time.

 

[Fu-Kwun Hwang]

I installed Safari on my computer and the above simulation was working fine.
This post is created when I was using Safari. The interface look nice!
:-)

[lookang]

i think i will revert to a lower version of EJS and recompile the applet.

made some changes

[lookang]

any idea why the new applet at the very top cannot load ?

i recompile the output.
uploaded to a separate folder
rename the codebase to "http://home.phy.ntnu.edu.tw/~lookang/EJS/ejs_group.files/weexvav12.app/"



code="weexvav12.weexvav12Applet.class"codebase="http://home.phy.ntnu.edu.tw/~lookang/EJS/ejs_group.files/weexvav12.app/"archive="common.jar,weexvav12.jar,"name="weexvav12"id="weexvav12"width="800"height="489"

[Fu-Kwun Hwang]

I can view the applet in the first message body very well.
It run nicely. So I do not know what is the problem.

If you are using Firefox, Please check out "error console" and let me know what was shown their.

[lookang]

i see what you mean now, it load very slowly, i waiting for 5 minutes or so before the applet comes alive!

thanks! there is no problem now

[Fu-Kwun Hwang]

May be you did not have enough RAM or there are too many processes running at the same time.
I did not find any delay with my browser/computer.
Java need a lot of RAM if the program is for many dynamic objects.

[lookang]

LOL... you are right, it worked on windows 2 Gig ram (home), beautifully.

the other machine has windows 1 GB ram is slow until like not working when loading this page.

the joke is it was 512 Mb, until i added another 512 Mb thanks to a "friend".
 

i learn alot from you....thanks!
 

[Fu-Kwun Hwang]

RAM is relative cheaper. I would suggest you upgrad your RAM. Otherwise, you will waste a lot of time due to that.

I would rather has less powerful CPU but I want to have more RAM.
A high power CPU with less RAM is similar to a high speed car with small gas tank.
If you need to add gas every 3km, there is no need to have a high powered engine. :-)

[lookang]

my home computer windows OS is P4 3.0 GHZ with 2 GB ram, which i upgraded another 1 GB ram  recently

my 8 am to 6 pm computer is also windows OS is P4 3.0 GHZ with 1 GB ram, which i can't increase the ram by myself:(

i will remember to share that joke around LOL "If you need to add gas every 3km, there is no need to have a high powered engine. :-)"

[lookang]

strange,MAC OSX seems to have problem loading using both firefox 3 and safari. Any thoughts ? could it be the Java version of 1.5 instead of 1.6 needed ?

Java Plug-in 1.5.0
Using JRE version 1.5.0_13 Java HotSpot(TM) Client VM
User home directory = /Users/11
----------------------------------------------------
c:  clear console window
f:  finalize objects on finalization queue
g:  garbage collect
h:  display this help message
l:  dump classloader list
m:  print memory usage
o:  trigger logging
p:  reload proxy configuration
q:  hide console
r:  reload policy configuration
s:  dump system and deployment properties
t:  dump thread list
v:  dump thread stack
x:  clear classloader cache
0-5: set trace level to
----------------------------------------------------

[Fu-Kwun Hwang]

I do not have a Mac machine so I can not tell.
However, I always update to latest version.
I am using 1.6.0_07-b06

I download the above version because I wanted to try chrome (Google new browser).
It need latest java run time to view java applet.

[lookang]

unfortunately under software,  updates the curent java is the latest version.

guess i will find out why in later time

the earlier java applets like the vernier works in MAC OSX.

think i remember a check box to select java 1.5 or 1.6 compatible in EJS 4.0..... i go take a look again 

[Fu-Kwun Hwang]

You can select different JRE in EJS if you have more than one version installed.
In the past, it only affect EJS. EJS will use selected JRE to run itself and generated simulation.
However, java process did not kill itself when EJS or any java application finished, now.
The java console is always there once java has been activated.
I am not sure how it will affect your browser in MAC.
But I can select which JRE to use be used from java control panel (Right click java console icon) in Window system.

[lookang]

Question: Is it possible that EJS_4.0_080905 auto generated codes do not work after uploading to a webserver?
it works locally on the computer but after zipping and uploading, it does not. click this to see.
http://home.phy.ntnu.edu.tw/~lookang/EJS/EJS_4.0_080905/weexvav13newaddoption/weexvav13newaddoption.html

added options:
http://home.phy.ntnu.edu.tw/~lookang/EJS/EJS_4.0_080905/weexvav17rebuild/weexvav17rebuild.html





Reference:
http://www.ngsir.netfirms.com/englishhtm/Kinematics.htm


added new options to be able to select
simple acceleration
uniform motion
simple deceleration
rise and fall
fall and rebounce
edit v-t graph


the physics for option "fall and rebounce" is rather too long a time.

any idea how i can improve it ?

source code
download the *.jar for using the applet on standalone without internet connection.

[Fu-Kwun Hwang]

Question: Is it possible that EJS_4.0_080905 auto generated codes do not work after uploading to a webserver?
it works locally on the computer but after zipping and uploading, it does not. click this to see.
http://home.phy.ntnu.edu.tw/~lookang/EJS/EJS_4.0_080905/weexvav13newaddoption/weexvav13newaddoption.html

The above simulation works fine with my browser. Simulation at the above link is also working fine.
So I do not know what is the problem? Is it due to your browser setting?

[lookang]

i suspect firefox 3 on Mac osx is giving me this problem.
i tried safari on Mac osx  nope it also didn't load as well
Yes, you are correct, the above applet does load properly even with Windows 1gb ram, take some time but work well:)

Question:how to make the simulation more like fall and rebounce ?
i have this technical problem,
to make T[4] = 10 and T[6] = 10.
but it will screw up the rest of the calculation for acceleration etc....
any simple way to make the simulation more like a fall and rebounce on a hard surface ?


 but i don't want to affect the original codes for the rest of the options.

any tips?  tricky right?

[Fu-Kwun Hwang]

Is it two questions? or  one question?

Question:how to make the simulation more like fall and rebounce ?

The particle was moving in the horizontal direction. I do not feel any fall effect?
May be you can draw another particle moving vertically (but you call it x , it will make user confused).
How about draw both vertical and horizontal at the same time.

and

i have this technical problem,
to make T[4] = 10 and T[6] = 10.
but it will screw up the rest of the calculation for acceleration etc....
any simple way to make the simulation more like a fall and rebounce on a hard surface ?
 but i don't want to affect the original codes for the rest of the options.

I do not understand your question? What is T? Why it will affect acceleration.
Could you copy the code and let me know where is the code? (constrains/user defined functions,...)

[lookang]

nevermind, i give up on the up and down, it is only a left and right applet now..


i will be adding capability for aiding this learning process.

Activity: Predict the Motions

Aim: In this activity, students explore the relationships between position and velocity of a moving object with the help of the datalogger. Students will use the distance sensor to track an object’s motion and to correlate the actual motion with its associated position-time, velocity-time and acceleration-time graphs in real time. Students will learn that from the graphical representations, it is possible to determine in what direction an object is moving, how fast it is moving, how far it travelled, and whether it is speeding up or slowing down.

Focussing Question(s):
•   How do the position-time, velocity-time and acceleration-time graphs relate to the actual motion of an object?
•   What do the gradients of the position-time and velocity-time graphs tell us about the motion?
•   What does the area under a velocity-time graph represent?

Initial Activity:
•   As a pre-lab activity, students are asked to sketch the position-time and velocity-time graphs of an object for different situations of an object:
o   at rest;
o   moving in the positive direction with a constant speed v;
o   moving in the positive direction with a constant speed 2v;
o   moving in the negative direction with a constant speed v (i.e. velocity = -v).

[lookang]

thanks to your help, i have converted to sharing jar files directly as a download available in your forum.

my html version of EJS applets seems to work and not work on some computers (Win or Mac).

every post of mine in community board has the option to download the jar files now!
the xml source code is also included in the jar package! so cool and easy.

wonder if iphone can run jar files? hhmmmmm

[lookang]

to discover the laws of kinematics by letting them control the motion of an object.
object can accelerate, slow down or even reverse! aided by real-time graphs.

found this http://www.crescent.edu.sg/crezsphere/applets/Physics/Applets/Kinematics.htm

After Google "kinematics java applet" My applet is top 5 ! Cool


http://qbx6.ltu.edu/s_schneider/physlets/main/constaccel1d.shtml
Likes: the Animation with Ghosted object
   the steps <>

http://www.ngsir.netfirms.com/englishhtm/Kinematics.htm
Likes: Excellent example

[lookang]

changes made:

1. added <> steps
2. added trail of object of visualizing, courtesy of Prof hwang's code http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=716.0
3. added the coordinates ( T[jid,yv[jid] ) to be shown when mouse over for clarity of exploring data points
4. made the checkboxes remember previous selection for ease of inquiry learning
5. added more boolean checkboxes for visualization of quantities
now and before a recent scanning of good applets

source codes in zip in attached here cos i can't attach at the top post without messing up the picture preview