The applet shows how vector was calculated.

1. Calculate X,Y components of vector ,

and

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.

or

You can select to operate in C=A+B , A=C-B or B=C-A mode.

**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.