i can only guess from the folder names.

thanks!

EJS 4.1 has a lot of improvements over EJS 3.47, everyone should get the latest version to try ;)

a cool Newton's Cradle applet that i always wanted to know how to make it a learning tool.

murcia is the name of the person? or is it Prof paco ? University of Murcia fem@um.es ?

My contributions are

1. changes made to sync top rectangle to appear directly above the string and mass for changing number of mass, n

2. input panel on the left

3. create a custom function drag() so that can read the codes clearly in a bigger view

4. added m"[j]"

5. add graph of ketotal, petotal tetotal

6. add angular momentum

7. added sound in collision

8. added dw[j]/dt = -g/l*Math.sin(alpha[j])-k*l*omega[j] for air resistance simulation

9. redesign the look and feel of the sliders bar etc

13May2011

added better controls

fix bug of KE = 0.5*m*l^2*omega^2

fix error by changing method back to BISECTION

made view more zoom in for increase in size

My learning journey for interactive balls mass, the codes i was looking for,

note: element is assigned variable name "ballMoved"

[code]// Compute new angle and freeze the ball

alpha[ballMoved] = Math.atan2(x[ballMoved]-xTop[ballMoved],yTop-y[ballMoved]);

omega[ballMoved] = 0;

// Limit the motion

double maxAngle = Math.PI/2;

if (alpha[ballMoved]> maxAngle) alpha[ballMoved] = maxAngle;

if (alpha[ballMoved]<-maxAngle) alpha[ballMoved] = -maxAngle;

// Check for one ball moving the others

for (int i=ballMoved+1; i

}

for (int i=0; i

// Force constant rod length

for (int i=0; i

y[i] = yTop - l*Math.cos(alpha[i]);

}[/code]

please note the codes has missing ++ symbols, due to forum's modified php?

so if you want to copy the codes go into the source xml files

[b][color=red]source code

download the *.jar for using the applet on standalone without internet connection.[/color][/b]