Playing with the rigid body is so much fun. In Maya 2011, it could be done easily. Set the particular object into active rigid body or passive rigid body. The simple point is, if it's active, it's doing the action (moving, falling, crashing,etc.), and if it's passive, it stays still, means it's accepting the action, just like the ball bouncing on the floor. The Ball is active, and the floor is passive. There are many tutorials out there to explain this principle even further. Have Fun :D