[quote author=ahmedelshfie link=topic=2313.msg8650#msg8650 date=1318331958]
Hi prof,
i try to add slider for have diffrent positions to satellite


Hi ahmed
is this what u want?

[quote author=ahmedelshfie link=topic=2313.msg8650#msg8650 date=1318331958]
so will be have also diffrent velocity, for example when satellite be near from earth velocity will be more fast and when be far
velocity will be more slowly, what i need to do that add slider for me control space between satellite and earth to can shown the diffrent velocity when change positions of satellite.
In case that i talk is this satellite motion at [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2244.0]http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2244.0[/url]
Also i need to know how when i change position the satellite trace change automatic too.
prof hwang already has physics equation inside if u just want to change the initial position of y it is quite easy, check the jar file.

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