read wat i said, and read that again. both plane and belt r moving at the same speed, how is a HUGE plane suposed to travel forward and create lift? and u guys r underestimating the tires purpose. read back to my treadmill post.

 

so what purpose do the tires serve?

unlike the treadmill, the plane's tires are not used to accelerate the plane, they just hold it up and allow it to move freely horizontally.

 

ok read the question. the belt is tuned to the speed of the plane. so even if u increase the thrust, the belts speed will also increase. tell me, how can something create lift and speed if the thing holding it up cant move forward

 

i shall respond to anything in the morning, good night

 

the plane only rolls on the wheels, the ground/belt isnt used to accelerate the plane.

 

I believe that is probably the original intention of the question. But since I committed myself to my answer, I feel I should explain more h:

Ok so let's think about it the way you're thinking about it. Now, let's say we have a brick, and we're standing at a conveyor belt like at the grocery store. The brick is basically the plane with the brakes on; it can't roll against the conveyor. Now, let's just say for imagining it that the conveyor belt moves at a constant speed, like at the store. So, let's say you push the brick forward an inch. The conveyor moves it back an inch, just like you said. But, as you apply more and more force on the brick (which is similar to the thrust the plane's engines apply to the plane), you can hold it in a steady position, even though the conveyor belt moves in the opposite direction. If you apply even more force, it will start to move the opposite direction of the conveyor belt. Now, imagine that we adjust the speed of the conveyor belt. If the belt moves slowly, then you have to apply less force to get the brick to move against the belt. If the belt moves faster, you apply more force. The amount of force you need to apply is related to the amount of friction between the brick and the conveyor belt. If the brick were on wheels (ie like a plane on wheels), you would need even less force to move it against the belt.

That is the essence of the argument. The only thing holding the plane back is the rolling resistance drag from the wheels to the conveyor belt. As long as the engine is capable of generating enough thrust to push against the rolling resistance, the plane will accelerate.

 

you guys are turning this into the .9 == 1 argument

 

Did you read any of the explanations? The planes don't just pick themselves off the ground, it accelerates even though the conveyor belt moves. And fighter jets use these things called JET ENGINES to magically create thrust. And fortunately for us, the US military was kind enough to let us use them on commercial and private planes to also magically create thrust.

And what does this have to do with street smarts? It's an imaginary situation that will never happen in real life. This is, by definition, a book problem.

 

Just answering the question h:

 

muthafawkin:werd: