Quote:
Originally Posted by burn_baby_burn
I didn't see the picture. How would it remain stationary? The same way a person running on a treadmill stays stationary. Allthough your feet are moving. Your body stays in one place.
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Your body doesn't remain stationary though, your body is moving constantly with relation to what you are pushing against; your feet push against the treadmill to move you forward. The treadmill surface itself is moving backwards though so you remain stationary, but only in relation to the walls and floor of your house.
In this case the plane is moving air to generate thrust, so the plane will move in relation to the surrounding air; the treadmill doesn't have anything to do with that, there's no energy being directed into the treadmill from the airplane.