For example, I want an rocking chair, with an woman rocking on it tooo...Is it possible?
Yes, it is possible. Use some
Weld objects and animate the
C1 properties in a loop.
For example, weld all the parts of your chair to an invisible 'base' part and then adjust the CFrame of the base part backwards and forwards to make it 'rock'.
Of course it is possible, it is only limited by your ability.
I would probably use welds to weld the chair and woman together. Then I would use body objects do change the rotation of the chair. It might be a little tricky to get an authentic look though.