When people go in those planes that go real high and then nose dive down toward earth in order to create an artificial zero gravity environment for the passengers, how exactly does that work? This is of course due to the gravitational constant of acceleration, and everything falls toward earth while accelerating at the same rate. But the plane eventually would reach terminal velocity when its drag force is equavalent to g, and therefore putting it in dynamic equilibrium. When that happens shouldn't the passengers continue to accelerate since there is no drag force on them? Sure, the system they are in is moving at a constant velocity once it reaches terminal velocity, but the passengers are still in earths gravitational field, and their bodies would have no idea that the system they are in is moving at a constant velocity until they hit a wall or touched the plane in some way (I am assuming they are just floating inside the plane while the artificial zero gravity envrionment is achieved).