conveyor belt and plane answered at last ??

In real life I know the plane can move forward and take off, but not in the parameters of the question.


So, as I said pages ago, the question as interpreted by you is invalid. Do you really believe that that is what the original question writer had in mind?
 
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Ok once more...

A plane comes into land, landing gear is down, when wheels touch the runway they smoke because they were stationary but straight away they start to speed up till they match the speed of the plane or in other words match the runway going backwards, they then stop smoking

You can not possibly disagree with the above, its impossible.

So basically the wheels are spining/travelling/moving forward whilst the runway is going the otherway.......BOTH at the same speed

Now going back to the bloke on the checkout conveyor wearing rollerskates, if the conveyor was moving backwards (simulating the runway), if i we're to push him forward his wheels would spin faster than they already were, to say they won't means they would skid and smoke, just like tyres do when the wheel speed doesn't match the road speed, see above example of plane touching down
 
The plane's method of propulsion acts on the air, not the ground.

Therefore the plane will take off, regardless of what speed the belt or the plane's wheels are doing.
 
So if i put a model plane on a dining table and pulled the table cloth out from under it are you suggesting the wheels would not rotate the opposite way?
 
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So, as I said pages ago, the question as interpreted by you is invalid. Do you really believe that that is what the original question writer had in mind?

Irrelevant Joe concentrate on what the writer did write.
 
Now going back to the bloke on the checkout conveyor wearing rollerskates, if the conveyor was moving backwards (simulating the runway), if i we're to push him forward his wheels would spin faster than they already were, to say they won't means they would skid and smoke, just like tyres do when the wheel speed doesn't match the road speed, see above example of plane touching down

The only relevant part of your post crank is the wheels spin faster than.

Man on skates is stationary on the moving belt the contact speed of the wheels would equal the speed of the belt, if you push him forward then it stands to reason the wheels must be going faster than the belt.
 
So if i put a model plane on a dining table and pulled the table cloth out from under it are you suggesting the wheels would not rotate the opposite way?

No the wheels will turn and you'll need a force/energy to stop it going backwards.
 
So, as I said pages ago, the question as interpreted by you is invalid. Do you really believe that that is what the original question writer had in mind?

Irrelevant Joe concentrate on what the writer did write.

Don't be ridiculous - the question as interpreted by you is invalid. That IS relevant.
 
The plane's method of propulsion acts on the air, not the ground.

Therefore the plane will take off, regardless of what speed the belt or the plane's wheels are doing.

Irrelevant securesparks, it needs force/energy and wheels, just to stop the plane going backwards. call it thrust if you like.
 
This is the original question....

An aircraft is standing on a very long runway that can move (a conveyor belt). The aircraft moves in one direction, while the conveyor belt moves in the opposite direction. This conveyor belt has a control system that tracks the aircraft's wheels speed and tunes the speed of the conveyor belt to be exactly the same as the wheels, but in the opposite direction. There is no wind. The pilot begins to add thrust to the engines...

Will the plane ever take off?

Which part don't you understand joe

Note the same speed as the wheels.
 
So if i put a model plane on a dining table and pulled the table cloth out from under it are you suggesting the wheels would not rotate the opposite way?

No the wheels will turn and you'll need a force/energy to stop it going backwards.

I know they will, as will most sane people, the question was for secure as to whether he thinks they'll spin or stay still
 
Irrelevant Joe concentrate on what the writer did write.

OK. I'll do just that.

The conundrum does not state that the conveyor's movement keeps the plane in the same position relative to the ground, just that it moves in the direction opposite to any movement of the airplane.

While the argument about the speed of the conveyor belt in the opposite direction preventing the plane from accelerating initially seems logical, it is irrelevant to what is happening to the plane, because the engine is acting on the air.

Edited to add DIA's quote.
 
The plane's method of propulsion acts on the air, not the ground.

Therefore the plane will take off, regardless of what speed the belt or the plane's wheels are doing.

Irrelevant securesparks, it needs force/energy and wheels, just to stop the plane going backwards. call it thrust if you like.

What I meant was that the speed of the conveyor is not important, the plane will still take off.
 
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