Re: weight of a bird in a cage

[Bob Sciamanda <trebor@VELOCITY.NET>]

This would make a neat movie - also on the WEB as an applet!
It could save a lot of flapping and move everyone to the top of the
ladder!

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor


----- Original Message -----
From: Jim Ealy <Jim_Ealy@RCDS.RYE.NY.US>
To: <PHYS-L@lists.nau.edu>
Sent: Thursday, September 02, 1999 12:42 PM
Subject: Re: weight of a bird in a cage


> Listmembers;
>
> My nature always says go to the lab when I hear "opinions" (I know that
> places me several rungs down THE ladder)
>
> My high school students several years ago made a box from dry-cleaner's
> plastic wrap and balsa - total was less than 20 grams about 50 cm by 50
> cm. A closed system sealed with tape, after fly was inserted - positive
> pressure.  We waited until spring to capture one of those large flies
> (commonly called - casement flies) that emerge in rooms.  They placed
the
> fly in the "box" and placed it on a top-loading balance: 0.1 mg.  There
is
> no question about what happens (flying,landing, starting off from bottom
> or side or top (or repeating after punching holes in plastic for air to
> move in or out as in an open system)). "It" only becomes difficult when
we
> as teachers try to make "it" more than "it" is.
> ................butterflies "work" well also.
> Jim Ealy
> Education by Demonstration