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John McLeod VII
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Message 1266558 - Posted: 2 Aug 2012, 0:12:35 UTC - in response to Message 1266554.

Okey Dokey.

This one might be a little abstract.

I learned yesterday that something taught to all school children is completely incorrect. It concerns Physics. What is it?

Newton's apple?
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Message 1266559 - Posted: 2 Aug 2012, 0:15:00 UTC

Not wholly unrelated, but less organic.
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Message 1266601 - Posted: 2 Aug 2012, 4:17:08 UTC

2 different weight canon balls from the leaning tower of Pisa?
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Message 1266643 - Posted: 2 Aug 2012, 8:36:06 UTC

Think of something going the other way.
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Message 1266886 - Posted: 3 Aug 2012, 1:36:32 UTC

What goes up must come down. It is still true, but it may take a while, and there is no guarantee about where it comes down.
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Message 1266972 - Posted: 3 Aug 2012, 9:09:28 UTC

Newton's laws of motion?
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Message 1267056 - Posted: 3 Aug 2012, 14:11:55 UTC

Clue: Those Magnificent Men
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Message 1267062 - Posted: 3 Aug 2012, 14:18:55 UTC

The rules of aerodynamics?
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Message 1267067 - Posted: 3 Aug 2012, 14:25:05 UTC

Ideal angle for maximising shot distance?
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Message 1267078 - Posted: 3 Aug 2012, 14:57:04 UTC

Is this about Bernoulli's principle?
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Message 1267750 - Posted: 5 Aug 2012, 0:00:40 UTC

Related to Aerodynamics and Bernoulli's
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Message 1267846 - Posted: 5 Aug 2012, 9:41:56 UTC

Bernoulli's principle and airplane aerodynamics. (don't know if they teach that to children though)
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Message 1267849 - Posted: 5 Aug 2012, 9:44:54 UTC - in response to Message 1267750.

Related to Aerodynamics and Bernoulli's

Is it about the lift on an airplane wing?
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Message 1267851 - Posted: 5 Aug 2012, 9:46:30 UTC

Now you're getting there.
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Message 1267858 - Posted: 5 Aug 2012, 10:08:40 UTC

boundary layer?
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Message 1267859 - Posted: 5 Aug 2012, 10:13:58 UTC

Think about why a wing produces lift
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Message 1267868 - Posted: 5 Aug 2012, 11:02:20 UTC

laminar airflow
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Message 1267873 - Posted: 5 Aug 2012, 11:25:28 UTC

Now think about what children are taught about the airflow over the wings that causes lift.

(Maybe this is just UK schools, perhaps US ones have stopped teaching this since it's incorrect)
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Message 1267875 - Posted: 5 Aug 2012, 11:43:49 UTC

Air flows over the top of the wing faster then the bottom so it creates a vaccum there by creating lift. Is how we learned it I think, Mind you I havent been in school for 41 years now.
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Message 1267910 - Posted: 5 Aug 2012, 13:51:26 UTC

That's correct.

The snippet i was looking for is that school children (certainly over here) are taught that because the air travelling over the top of the wing has further to go, it has to travel faster in order to catch up with the air below the wing. Otherwise known as the equal transit time theory.
It's not true, air does flow faster over the top, thereby creating lift due to lower pressure, but it doesn't somehow have a need to catch up to the air it left behind that went under the wing, and indeed doesn't.

James, you were as good as there, your turn.
____________
Homme petit d’homme petit, s’attend, n’avale
Homme petit d’homme petit, à degrés de bègues folles
Anal deux qui noeuds ours, anal deux qui noeuds s’y mènent
Coup d’un poux tome petit tout guetteur à gaine

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