Date: Tue, 26 Mar 2002 12:20:09 -0500

Author: "pojhome@swbell.net"

Subject: RE: trees

Post:

Yes. Living organisms (plants as well as animals) sense and respond to acceleration. To them, the acceleration due to gravity is no different than the acceleration due to changes in velocity.

Paul O. Johnson
The Science Place
Dallas Texas

Original Message:
-----------------
From: Anthony Lapinski anthony_lapinski@pds.org
Date: Tue, 26 Mar 2002 11:51:33 -0500
To: tap-l@listproc.appstate.edu
Subject: trees


I just came back from a ski trip at Lake Tahoe. So many trees!

I noticed that the mountain trees always grew straight upward no matter
what the slope of the mountain. Is this because they must fight gravity
which is straight downward?

I also read somewhere that if you plant a seed (in soil!) on the edge of a
rotating turntable, it will grow and lean toward the center of the circle
because it must fight its own inertia (the "centrifugal" force -- a
fictitious force) -- the tendency for it to fly off on a tangent.

Are these two situations similar?

Anthony Lapinski
Princeton Day School

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