For older children, you should do real inverse square orbits. Squeak Etoys
does these very well. Don't forget that you can choose to have the "origin
at center" in any playfield. This means that any player put in a playfield
will also act as a vector, and this can make it very easy to model 2D
accelleration, velocity and position. (There is also a vector vocabulary
for players which can be turned on to allow simple + and - vector
arithmetic to be done between players, etc.)
A fun thing to do (especially since it is intractable with classical math)
is to do the 3 to n body calculations. Turn the pen on for the third body
and you get beautiful chaotic curves, etc.
Also, when using embedding, think about what it means for each player to be
a coordinate system for the players embedded in it.
Cheers,
Alan
At 04:34 PM 2/16/2006, Randy Heiland wrote:
>Might it be possible someday to add a line to the balloon help for a
>sketch's rotation center to "press Shift to move" -- assuming this action is
>required across operating systems. Not having this causes some frustration
>in workshops.
>
>--Randy
>
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