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Plane makes its own "gravity" (long)
Posted by Eric Law [Email] (more from Eric Law) on Mon, 2 Aug 2010 16:23:05
In Reply to: How is that possible? Gravity pulls things, bender
[Profile/Gallery]
, Mon, 2 Aug 2010 10:17:23
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Well okay not like on Star Trek! ;^)
Think of it this way... a plane is flying level in a normal orientation. Now the pilot pulls back on the yoke, causing the plane's nose to rise. As a passenger, you feel pressed into your seat, as if the force of gravity increased. Of course that's not the case, what's actually happening is the plane is forcing you upward, but it feels like you're being pulled downward. And the harder the pilot pulls on the yoke, the greater the force that you sense pulling you (and everything else, like, say, a pitcher of iced tea) toward the floor.
Now imagine exactly the same thing happening, but when the plane is upside-down. Gravity is now pulling you toward the ceiling of the plane. But by pulling on the yoke, the pilot can create a force that seems to pull you toward the floor. Depending on how strong that force is, it can reduce the apparent effect of gravity, cancel it out, or overpower it. If the pilot pulls hard enough to create a force toward the floor of 2G, when you subtract out the 1G pulling you toward the ceiling (remember the plane is still upside-down), you'll end up with a 1G apparent force pulling toward the floor. This is the same as when the plane is flying straight & level, and everything would seem the same, including that poured liquids would go toward the floor.
And if you think that explanation was difficult, try making it actually happen in an airplane! :^)
Eric
posted by 72.93.22...
Posts in this Thread:
- Airplane question - cup stays still on table, bender
, Fri, 30 Jul 2010 07:13:45- A banked turn with food and drinks out?, Mike Lynch
, Sat, 31 Jul 2010 17:45:01 - Re: Airplane question - cup stays still on table, JimBlake
, Fri, 30 Jul 2010 11:07:52 - Re: Airplane question - cup stays still on table, EGD
, Fri, 30 Jul 2010 08:35:37 - Re: Airplane question - cup stays still on table, jeff in MD, Fri, 30 Jul 2010 07:28:58
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