for clarification, could you please post a picture of a JET that is entirely propelled by it's wheels?

Not if the treadmill spins as freely as the skates. You get the gears analogy, right? You seem to be coming around.

Answer my question. Then I'll respond to you.

Your comment earlier just proves you have no answer.

Nighty-night.

dun,not when the wind is also propelling the treadmill in the opposite direction...LMAO

your question is a plane crash... it's doesn't fly but it is most definitely moving forward.

One again, IS THIS PLANE ENTIRELY PROPELLED BY IT'S WHEELS?

:LOL:LMAO

What force is counteracting the wind?

remember Newton...

Here's a cool experiment that's a pretty fun statics problem to prove. Take a yard stick or any stick like a dowel, spread out your hands and balance it on your index fingers. Then slide your hands toward each other. You will notice that the weight transfers between the two fingers until they come together. That point is the center of mass for that object.

Not this.

This.

If that bar is free to move, it will move, the gear will spin and whatever is attached to that axle will stay where it is.

Both the bar and the gear are free to move relative to the ground. Their relative velocities will depend on the net force balances on the two objects.

not if I push it...

I've pointed out that my treadmill must have equal or less resistance to spinning (i.e. moving forward in its own direction) than the plane has to going forward.

Keep in mind the gear IS moving. When it spins, it's moving. No forward movement by axle etal is necessary to satisfy that.

http://www.dcasali.com/images/filmnt...ales_frown.jpg

WELL?

Okay.

Wow, I'm amazed that you guys are still arguing the plane on the treadmill. This is a classic physics test question that takes something that seems to complicate the problem (the treadmill) but is really just a distraction. Planes only fly based on AIRSPEED. Anything related to the groundspeed is irrelevant as to whether the plane will fly or not!! Besides, there would only be an extremely neglible force imparted to the treadmill by the plane's wheels. This would be from friction generated in the wheel bearings and rolling resistance in the tires. Bottom line the plane is going to fly no matter how fast or slow the treadmill is going.