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Author Topic: Vertical Spring  (Read 25419 times)
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Fu-Kwun Hwang
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on: August 18, 2006, 02:44:00 pm »

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This is an applet related to a spring sibject to gravitation force.




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lookang
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Reply #1 on: July 03, 2007, 07:50:12 am » posted from:Singapore,,Singapore

hihi, great stuff u made prof hwang.

i think this page didn't load well, the ejs button is missing Smiley It is not the same as the rest of ejs downable *.xml files.
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Fu-Kwun Hwang
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Reply #2 on: July 10, 2007, 06:27:06 am »

It is fixed now.
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rahmaniah
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Reply #3 on: June 09, 2008, 01:53:40 pm » posted from:Surabaya,Jawa Timur,Indonesia

Dear Mr. Hwang,

I am Nia, I had been studying in Institute of Technology Sepuluh November (ITS) Surabaya, Indonesia, majoring in Physics.
First of all, I’m sorry to disturb you again. And thanks for your reply during this time.
I use Ejs version 3.46. This is my source program with name circular spring.xml. Continuing my last questions at my email ;









•   How is the analytically equation, kinetic and potential energy from spring system as seen on the picture above with the particle amount of 8?
•   How can we know the analytical solution to get the acceleration equation?
If I run this system by choosing n = 5,  why the values from y6 (n=6) until  y8 (n=8) are still calculated from numerical data?

At last but not least, thanks for all your helps.



Trully yours,
Nia
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Fu-Kwun Hwang
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Reply #4 on: June 09, 2008, 02:13:45 pm » posted from:Taipei,T\'ai-pei,Taiwan

1. You can get velocity,height and mass for each particle in the simulation, so that you can calculate their kinetic energy and potential energy individually. And the sum of those will be the energy for the whole system.
2. EJS help you calculate the integration numerically. It would not obtain analytic equation for you.
3. If array were used in the evolution equation, for example 
Code:
d x[i]/dt =v[i]
, then the whole array x[n] will be evaluated.
If you do not want some of the value changed, you need to set their derivate value to zero.
For example:
Code:
for (int i=5;i<n;i++)v[i]=0.;

Did you check out Circular Spring Thing?
It is almost the same as your circularspring.xml (number of springs can be changed from 3-60).
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smith88
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Reply #5 on: August 19, 2011, 06:40:17 am » posted from:Dhaka,Dhaka,Bangladesh

Really this is a nice & effective sites. It is very helpful for us. these spammers are so articulate.
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