1. Would a chaotic motion of the ruler be possible without any driving (without the moving suspension point)?
A yes
B no
2. Driving injects energy into the system. Why does not the rotation of the ruler become faster and faster?
A friction (e.g. air resistance) is too strong
B friction compensates energy input, on average
3. Can one decide from a short piece of a motion that it is chaotic?
A not
B yes
4. Should a motion which eventually dies (stops) be called chaotic?
5. Can a motion which eventually dies (stops) be called chaotic before it dies ?
6. Can it happen that a motion is chaotic in one of its variables (e.g. in position), but not in another one (e.g. in mechanical energy)?