moving Group away,but objects on it will not fall

Getting Started Newbie Questions
#1

I made a ball on the ground objects,and I let ground objects insert into a group.

when I move away the group(by changing the x with a touch),the ball still on the screen,not fell !

I try again without the group,and move the ground objects away directly,
the ball fell !

can someone tell me why ?

thanks alot ! [import]uid: 21680 topic_id: 8888 reply_id: 308888[/import]

#2

Physics don’t work between display groups. This was done on purpose so that you can move the display group around without affecting the objects in it; refer to the Egg Breaker sample to see what I mean. [import]uid: 12108 topic_id: 8888 reply_id: 32546[/import]