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Originally Posted by qwikz28
but its not free to move cause the belt can still accelerate once the thrust kicks in. thats how it got up to speed in the first place
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the thrust acts on the body of the plane. the belt acts on the wheels. two forces working on two different objects.
You're thinking of it like its a car. a car would need to out accelerate the belt to move because the wheels are what drives it. since the wheels are what is providing the thrust, the thrust can be controlled by another force acting DIRECTLY upon it (the belt) The plane is driven by the turbines which are NOT dependent on wheel speed. For the plane to be held stationary, it will need to be restrained. The belt does not act directly upon the thrust generated by the turbines, so the plane will still move forward.