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To live close to great minds is the best kind of education. ..."John Buchan (1875~1940 Scotticsh historian, Governor General of Canada)"

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 Author Topic: Ejs Open source Circular Motion and Centripetal Force java applet F = m*v^2/r  (Read 16277 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
lookang
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 « Embed this message on: December 12, 2008, 01:14:55 am » posted from:Singapore,,Singapore

Circulation Motion and Centripetal Force applet modified for F = m*v^2/r lookang
Ejs Open source Circular Motion and Centripetal Force java applet F = m*v^2/r

applet modified legally under from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=693.msg2488#msg2488
Circular motion: acceleration always perpendicular to velocity

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 circularmotion.PNG (13.82 KB, 734x548 - viewed 669 times.) « Last Edit: June 16, 2010, 12:20:16 pm by lookang » Logged
lookang
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 « Embed this message Reply #1 on: December 12, 2008, 05:09:41 pm » posted from:Singapore,,Singapore

updated with minor changes.
the download is on the first page

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for

Hi, I think this applet is great and I want to use it for my high school physics class.

My goal is to have my students investigate the relationships involved in circular motion.

I want them to understand the relationship between the following
- the centripetal force as a function of mass (with velocity and radius remaining constant)
- the centripetal force as a function of velocity (with mass and radius remaining constant)
- the centripetal force as a function of radius (with velocity and mass remaining constant)

With the applet, I have successfully been able to accomplish the third, but I can not find a way to manipulate for the other two.

Is there a way that can be done?

Thank you,
Nicole

1. now need to set the velocity magnitude else no circular motion. the force is toggling , not sure if i did it correctly
The force(acceleration) always perpendicular to velocity, and you always get circular motion (but different size of trajectory)
If the acceleration is in the direction of velocity, the acceleration will change the magnitude the of velocity(change speed).
Acceleration is the rate of the velocity change. a=dv/dt.
So, if the acceleration is perpendicular to the velocity, the velocity will change direction only.

You can drag the velocity to change its direction and magnitude, the magnitude of the force is changed by slider bar.
2. you can input the value for radius now! change to field instead of slider due to sometimes you want to input infinity for straight line path

please let me know if i made/did any physics error(s).

took me 3 hours to design for this! Yeah!

source code
download the *.jar for using the applet on standalone without internet connection.
 *** There are 1 more attached files. You need to login to acces it! « Last Edit: August 29, 2009, 03:29:15 pm by lookang » Logged
lookang
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 « Embed this message Reply #2 on: June 16, 2010, 08:57:26 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

i had an interesting problem with this source xml.
this does not read in Ejs 4.1-4.2-4.3.
i tried Ejs 3.47 and it manages to load but with some error in the variables.
i clean up the variables and remove middle " in the Frame which is causing problem to the editor in Ejs 4.1-4.2-4.3.

now it is works after i open using Ejs 4.1-4.2-4.3.
almost lost this applet codes, then i have to updo again, lucky my method saved the xml.

while re looking at the applet, i am learning that i didn't remember this!
i am very impressed by this code
Code:
// for autoscale drawing
if(xxmax || y>ymax){
xmin*=1.2; //xmin = xmin*1.2;
xmax*=1.2;
ymin*=1.2;
ymax*=1.2; // preserve the square look for x and y if the multiplier is the same 1.2
}
i will use it in my projectile motion applet soon
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lookang
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 « Embed this message Reply #3 on: June 24, 2010, 12:58:52 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE

interesting stuff for circular motion.

there is a mindmap tool
http://www.fabrikz.com/Fabrikz2/list.html
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To live close to great minds is the best kind of education. ..."John Buchan (1875~1940 Scotticsh historian, Governor General of Canada)"