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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

A first version of Gravity Freeplay

I find it a little mesmerising. I like to set things going and check back every so often to see what is happening.

The gravity simulation is fairly good ... I tested internally with the measurements of Sun/Mercury/Venus/Earth and they behaved nicely

Comments/suggestions?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

Heehee, this is fun!

I managed to build a Sun + Earth + Halley's Comet model that ran nicely for a while, but then the comet crashed into Earth which made the Earth crash into the Sun.

Why did the vector cross the road?

It wanted to be normal.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

New Version 0.8

It will ask you what mass you want (if you don't want it to ask, there is an "ask" toggle button)

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

I think a pause button would be useful.

It's hard to make stable systems with more than two planets right now, because the first two settle into an orbit and then when you introduce a third it usually crashes into one of them or flies away.

Why did the vector cross the road?

It wanted to be normal.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

Pause is good.

Yes it IS hard to make stable systems of 3 or more ... maybe that is also true of planetary systems.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,516

Someone was able to make a 9 or 10(?) planetary system that will and has remained stable for billions of years.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**simron****Real Member**- Registered: 2006-10-07
- Posts: 237

D'oh! So close!

*Last edited by simron (2009-05-12 13:12:28)*

Linux FTW

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