On Tue, 28 Nov 2000, Mark Guzdial wrote:
> Thanks, Jecel!  This is great.  I still  have exercise answers and 
> teachers notes to write, so with your permission, I'll pass this on 
> to teachers that way.

Please do.

While I came up with this demo on my own, Andrea diSessa has a much
better version of it in Boxer (see the first 2 chapters of the book
"Changing Minds: Computers, Learning, and Literacy" at
http://soe.berkeley.edu/boxer.html/papers.html). Vector objects are
represented by arrows and you can drag their heads around to change
their values. I did find the spacecraft simulations too hard to control
by dragging the acceleration arrow, but I am not really part of the
video game generation...

The arrow that indicates the heading and center of rotation for each
morph (part of the halo) might be patched to show something similar to
Boxer.

-- Jecel