how apply physic on group or group member object....

Can any body give me suggestion or guideline to apply physic on group or group member object…? i tried but it behaves unexpectedly…

[import]uid: 42177 topic_id: 8814 reply_id: 308814[/import]

pls help… guide me… [import]uid: 42177 topic_id: 8814 reply_id: 32930[/import]

When you say that it behaves unexpectedly, can you be more specific? [import]uid: 52491 topic_id: 8814 reply_id: 33438[/import]