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Started By
Message
re: Can this 747 take off?
Posted on 4/11/24 at 12:18 pm to tigerfoot
Posted on 4/11/24 at 12:18 pm to tigerfoot
quote:
For the energy to be applied to forward momentum of the plane it would have to exceed the energy of the treadmill, which in this absurd scenario will not happen.
No.
Just stop.
The wheels on the plane "free wheel". Just like a hot wheel car.
The treadmill exerts zero force on the plane (only the wheels).
Thus... the jet engines' thrust the plane forward (because the wheels are freewheeling... and the speed of the treadmill has no bearing on the engine's thrust).
When the plane thrusts forward, the wheels are moving faster than the treadmill. And the question is broken. Because the force of the treadmill is absorbed by the freewheels of the plane, the plane will always thrust forward. And the wheels will always move at a faster rate than the treadmill.
This post was edited on 4/11/24 at 12:24 pm
3
Posted on 4/11/24 at 12:21 pm to meansonny
Nothing moves besides the treadmill, wheels and time marches on.
Posted on 4/11/24 at 12:27 pm to meansonny
quote:Why do they turn? Put your hot wheel car on a treadmill then apply force pushing the car, You would have to apply force to keep the plane from going backwards, correct? The faster the treadmill moved the more you would have to apply.
The wheels on the plane "free wheel". Just like a hot wheel car.
This post was edited on 4/11/24 at 12:29 pm
Posted on 4/11/24 at 12:35 pm to meansonny
quote:
The wheels on the plane "free wheel". Just like a hot wheel car.
The treadmill exerts zero force on the plane (only the wheels).
Thus... the jet engines' thrust the plane forward (because the wheels are freewheeling... and the speed of the treadmill has no bearing on the engine's thrust).
Again, this is a dumb hypothetical. But to your point, its simply wrong.
The wheels do not nor have they ever simply "free wheeled". There is a ton of friction from the load of the plane on them.
If you put a stroller on a conveyor in an airport it doesn't just sit there in place. It will move down the conveyor.
In regards to the 747 taking off without wheels rolling, lol. Okay
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