Ejs Open source java applet Resolving a Vector in 2 perpendicular directions

[lookang]

Resolving a Vector in 2 perpendicular directions by lookang
original source code by hwang fu-kwun, remixed for helping visualization of components

reference:
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=634.msg2195#msg2195
http://www.walter-fendt.de/ph14e/forceresol.htm

Embed a running copy of this simulation
<applet code='users.sgeducation.lookang.sinecosinewee03_pkg.sinecosinewee03Applet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/14019/ejs_sinecosinewee03.jar' name='sinecosinewee033713' id='sinecosinewee033713' width='685' height='680' 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=3713' target='smfejs'>Run simulation</a>

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
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]

more

1. added centre of (x,y) to make drawable visible
2. used actual length instead of unit length  xp=x+Math.sqrt(dx2*dx2+dy2*dy2)*Math.cos(Math.atan2(dy2,dx2)-Math.atan2(dy1,dx1))*Math.cos(Math.atan2(dy1,dx1)); // xp = x + component cta1
yp=y+Math.sqrt(dx2*dx2+dy2*dy2)*Math.cos(Math.atan2(dy2,dx2)-Math.atan2(dy1,dx1))*Math.sin(Math.atan2(dy1,dx1)); //
3. added
Rcos = R*Math.cos((Math.atan2(dy2,dx2)-Math.atan2(dy1,dx1)));
Rsin = R*Math.cos((Math.atan2(dy2,dx2)-Math.atan2(dy1,dx1)));
4. change the logic of drawing the angle polyon to
dc = (Math.atan2(dy2,dx2)-Math.atan2(dy1,dx1))/(n-2);// modify to draw from black line sing dx and dy as inputs
px[0]=x; // for drawing angle polygon
py[0]=y; //
for(int i=1;i  c=Math.atan2(dy2,dx2)-(i-1)*dc;  // modify to work drawing from black line
//  if(c<-pi)c+=2*pi; // no necessary
  px=x+d*Math.cos(c); //
  py=y+d*Math.sin(c); //
}
5. added functions to make slider draggable to control the graphics, thanks Prof Hwang!