There is a issur to move four amot without a Kippa, or six feet according to Sepharadim. (Shulchan Aruch 2:6) (Well there is a machloket wether it's really an issur or not, but that is a seperate issue. See Kaf Hachaim on the above for more on the subject.)
If a person was being moved by an outside force without a kippa, would that be violating the above? Or would it not be an issue since he isn't moving, but rather he is being moved. One practical example of this is a car. If someone is in a moving car, do they need to be wearing a kippa?
This question also extends to airplanes and roller coasters.