We know rotational motion as a combination (a resultant) of two effects the tangential velocity and a centripetal force. Does rotational motion turn into linear motion at the same instance this centripetal force goes absent, and that rotational motion can't be a natural motion caused by one single effect, and linear motion is the only (raw) motion present in the universe?
We take an example, a spacecraft going to the moon (or anywhere into outer space). That spacecraft will leave the earth's atmosphere, and continue to move in a spiral motion outwards, increasing in radius, due to the momentum acquired by the earth's rotation.
At some point that spacecraft should lose (if I'm correct) this rotational motion and shoot into a straight line, tangent to the last circle whose radius the distance from the earth's center. That's because the gravity (centripetal force) is no longer an acting force. Can this be true??
There's also a scene from the movie "Gravity" I didn't quite absorb. The astronaut keeps moving around when they separate from a rotating object and continue to move that way, (very famous scene in the trailer), is this accurate?