This is EJS version of [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=51.0]vector addition[/url].
The applet shows how vector was calculated.
1. Calculate X,Y components of vector ,
2. If you un-check x-y mode:
The sum is equal to sum of parallel components of in the direction of ,
and the normal component of always cancel out with each other. i.e.
You can select to operate in C=A+B , A=C-B or B=C-A mode.