Quote:
Originally posted by BlueSky:
You must have missed the part about it not mattering where the propelling force comes from. If the tires don't roll ALONG the ground, just rotate over the belt, the plane won't move. If you don't get that, forget it.

You're never going to agree with my logic and I sure don't agree with yours.
This isn't about agreeing.

This is about whether or not you folks have the cognitive abilities to understand why the correct answer is correct.

If the wheels roll, what is holding the plane back? Nothing! The wheels just spin faster if there's a belt. The plane still moves with respect to the earth as well as the atmosphere. Please explain how you are refuting the physics above. [Freak]

Quote:
Originally posted by Smith:
Who's the asshole who started this thread? mad
It's not Lizz's fault, it's Hawk's fault!!!

Happy new year, Hawk! [Finger] [Finger] [Too much XOC]

...

How is it that people who can't understand a high-school physics free-body diagram have deemed themselves more qualified than this guy:

Quote:
If I properly understand your travelator, the travelator moves at
exactly the speed of the airplane, but in the opposite
direction. This means the wheels rotate twice as fast as they would
on a normal runway and nothing else is different. Right?

In that case, I claim the plane would take off normally except that
the wheels would be rotating twice as fast as normally. Since the
frictional force is, as you say, f=uR, the frictional force will be
exactly the same in the two cases since v does not appear in the
equation for the frictional force. In other words, the frictional
force is independent of the speed. In that case the forces on the
plane are exactly the same whether the travelator is operating or
not and so the plane takes off the same way in the two cases.

-Dick Plano, Professor of Physics emeritus, Rutgers University