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#211
11-23-2005, 03:40 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] Uh. The conveyor belt moves at the same speed as the wheels as stated in the problem. Thus the plane cannot move forward. Seriously how much physics do you understand? Are you familiar with reference frames? 
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#212
11-23-2005, 03:41 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] isn't the whole premise of this post is that the plane isn't moving? [/ QUOTE ] I just skimmed this thread. The issue isn't whether or not the plane is moving on the runway. It's about whether or not air is moving across the plane's wings.
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#213
11-23-2005, 03:41 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
Uh. The conveyor belt moves at the same speed as the wheels as stated in the problem. Thus the plane cannot move forward. [/ QUOTE ] Seriously how much physics do you understand? Are you familiar with reference frames?
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#214
11-23-2005, 03:41 PM
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Re: think about this...
[ QUOTE ]
Ok, I think this will help some people. The numbers aren't really forces, and it's really confusing, but I didn't feel like painting out the explanation on a laptop. Basically, the plane is still moving along the conveyer belt. Think of the engines like a rope pulling the plane.  [/ QUOTE ] Me like funny picture. Ryan make no funny. Me sad.
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#215
11-23-2005, 03:42 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] Uh. The conveyor belt moves at the same speed as the wheels as stated in the problem. Thus the plane cannot move forward. Seriously how much physics do you understand? Are you familiar with reference frames? [/ QUOTE ] Explain how the wheels will move at the same speed as the plane in this example.
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#216
11-23-2005, 03:43 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] Uh. The conveyor belt moves at the same speed as the wheels as stated in the problem. Thus the plane cannot move forward. Seriously how much physics do you understand? Are you familiar with reference frames? [/ QUOTE ] Explain how the wheels will move at the same speed as the plane in this example. [/ QUOTE ] THIS JUST IN: WHEELS ARE ATTACHED TO THE PLANE
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#217
11-23-2005, 03:43 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] isn't the whole premise of this post is that the plane isn't moving? [/ QUOTE ] I just skimmed this thread. The issue isn't whether or not the plane is moving on the runway. It's about whether or not air is moving across the plane's wings. [/ QUOTE ] thats exactly what im basing my arguement on; if the plane isn't moving relative to the atmosphere, the plane doesn't take off....game over
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#218
11-23-2005, 03:43 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
The runway moves in the opposite direction of the plane at the exact same speed as the plane's wheels. [/ QUOTE ] The plane itself and the plane's wheels are not moving at the same speed. Everyone who doesn't understand that the plane will take off seems to be missing this.
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#219
11-23-2005, 03:45 PM
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Re: Physics graduate from Daryn\'s alma mater\'s answer
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] [ QUOTE ] Of course the plane has to be moving relative to the air around it (or the ground if that makes it easier). [/ QUOTE ] this is it, you need wind over the wings for lift!! a plane cannot get in the air without lift! wtf, i can't believe noone gets this [/ QUOTE ] Please explain specifically what FORCE is stopping the plane from moving forward (relative to the atmosphere, NOT the conveyor belt). [/ QUOTE ] Uh. The conveyor belt moves at the same speed as the wheels as stated in the problem. Thus the plane cannot move forward. Seriously how much physics do you understand? Are you familiar with reference frames? [/ QUOTE ] Explain how the wheels will move at the same speed as the plane in this example. [/ QUOTE ] THIS JUST IN: WHEELS ARE ATTACHED TO THE PLANE [/ QUOTE ] dude, one sec. if the plane's velocity is 100 mph in the +x direction and the conveyor's velocity is 100 mph in the -x direction (and the turbines are off), we agree that the plane is not moving relative to the ground, correct? now what happens if you apply a force to the plane in the +x direction? is it locked in space? can it not move?
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Linear Mode
