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Originally Posted by Ian
Okay, I'm going to explain it the same way Matt did for me.
put a toy car on a treadmill and hold it in one position. Now turn the treadmill on and keep holding it there. next, accelerate the treadmill. notice anything? it takes the same amount of energy (thrust) for you to hold the car there at 2 mph and 20 mph. push the car forward and you will notice that no matter how fast the treadmill goes, the car will move forward. you are acting as the jets on the plane and the cars wheels are acting as the planes wheels. the thrust pushed the car forward even though the treadmill accelerated.
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you are holding the car, its the same as airplain being tied down or me standing on the breaks as i give it throttle.