Something to entertain your brain a little bit.. this question has been argued and debated to death. Many of us have degrees in Physics, let's see what you think. A plane is on a movable runway, sort of like a conveyor belt. The runway is moving the opposite way as the plane, and its speed is continuously variable with the plane (so if the plane speeds up one way the belt will correspondingly move the other). The question here is will the plane be able to take off? Can it even move? Keep in mind several assumptions: 1) The wheels are free rolling. 2) Plane wings need a high and low air pressure gradient to achieve lift. 3) The plane has thrusters on its wings that do not power the wheels in the way a car does.