Re: Pinhole Digest #1682 - 02/06/05

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From: FARRELL (farrelwk@pacbell.net)
Date: Sun Feb 06 2005 - 15:30:05 PST 

Date: Sun, 06 Feb 2005 15:30:05 -0800
Subject: Re: Pinhole Digest #1682 - 02/06/05
From: FARRELL <farrelwk@pacbell.net>
Message-ID: <BE2BE87D.3A0B%farrelwk@pacbell.net>

Celia,
    If you can't find that activity, you can do the same thing with simple
blocks. Have them count the sides of a single block, knowing that
nourishment can only come into the cell through its sides. Then put 2 blocks
together and count again; then 3, etc. They will easily see that the bigger
it gets, the less surface area.
    Hope this helps. Kathe Farrell

> From: "Pinhole Listserv" <pinhole@exploratorium.edu>
> Date: Sun, 6 Feb 2005 00:20:02 -0700
> To: "Pinhole Listserv" <pinhole@exploratorium.edu>
> Subject: Pinhole Digest #1682 - 02/06/05
>
> Pinhole Digest #1682 - Sunday, February 6, 2005
>
> Double Dog Activity
> by "Celia Cuomo" <celia@mo.com>
>
>
> ----------------------------------------------------------------------
>
> Subject: Double Dog Activity
> From: "Celia Cuomo" <celia@mo.com>
> Date: Sat, 5 Feb 2005 16:26:10 -0800
>
> Greetings all,
>
> I am looking for an activity that I believe is called Double Dog. I
> lost the copy I got a few summers ago at a TI workshop. The activity
> uses blocks to model the fact that surface area to volume ratio
> decreases as 3-D objects increase in size. The idea is to make a small
> dog of blocks, figure out the surface to volume ratio, then make a
> larger dog, and figure out the ratio again. I want to use the activity
> to help my 7th graders understand the concept in relation to cells: as
> in, there could never be a cell the size of you.
>
> Anyone know how I can get a copy of the activity?
>
> Thanks,
> Celia Cuomo
> White Hill School
> Fairfax, CA 94930
> celia@mo.com
> 415-454-8390 x218
>
>
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