Plane and a conveyor belt

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   the whole point was that the speed of the aircraft is matched 

Doesn't matter.

i.e +100 for the aircraft and -100 for the resistive force.. therefore, the overall force is 0 i.e no movement.

Except that there is no resistive force, the conveyor isn't a resistive force, thanks to the wheels bearings. 

 The wheels have bearings that enable them to spin freely.  Essentially there is no resistance supplied by the wheels, so no resistance is transfered to the aircraft. 

There is if cousre, but way less than would make a diferance.

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MartinW Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator in Command Joined: 31 Mar 2008 Location: United Kingdom Points: 26722	Post Options Post Reply Quote MartinW Report Post Thanks(0) Quote Reply Posted: 06 Jan 2010 at 10:20pm
	the whole point was that the speed of the aircraft is matched Doesn't matter. i.e +100 for the aircraft and -100 for the resistive force.. therefore, the overall force is 0 i.e no movement. Except that there is no resistive force, the conveyor isn't a resistive force, thanks to the wheels bearings. The wheels have bearings that enable them to spin freely. Essentially there is no resistance supplied by the wheels, so no resistance is transfered to the aircraft. There is if cousre, but way less than would make a diferance.

Slopey Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator in Command AirHauler Developer Joined: 11 Jun 2008 Points: 8280	Post Options Post Reply Quote Slopey Report Post Thanks(0) Quote Reply Posted: 06 Jan 2010 at 11:38pm
	Kelvin - your analogy with a person on a treadmill is incorrect. If the person was on rollerskates, on the treadmill, that'd be correct. If the rollerskates had frictionless bearings, you could speed the belt up/down and you'd stay where you were as the rollerskate wheels will spin at the same speed as the belt. Now if you push yourself forward, then the belt speed will increase, but so will the wheel speed in response, so you'll still go forward as there's nothing to counteract your thrust input. The belt speeding up can't counteract it, as it can't transfer any force to you, only to the wheels which are touching it, and as they're frictionless, nothing gets transferred to the axles of the rollerskates.
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