Rotating Space Station

In several science fiction movies, space stations are presented as spinning concentric rings; the centrifugal force, an apparent force resulting from the true mechanism of centripetal force, provides a sensation of apparent weight to the crew due to the radial push against the floor, giving an environment similar to Earth for working and living. One ring can rotate to simulate gravitational force and the other can be static to take advantage of weightlessness for other kinds of tasks.