Re: arons and dry ice

[cliff parker <cparker@CHARTER.NET>]

No need for a 50 pound chuck of dry ice or glass.  Any size chuck will do.
Something about the size of your computer mouse works well.  Place it on top
of a demonstration table or tile floor if that's all you have.  Make sure
the surface is as clean as you can get it.  Let the chuck sit for a few
minutes until the bottom surface of the ice becomes flat.  Then just give it
a scoot.  Extension - take a wet paper towel and wipe some moisture on the
table top then slide the dry ice over the moisture.  Cool smoke! Extension
2 - put a chuck of dry ice on an aluminum chalk tray or other metal surface.
Press down with a stick or while wearing a glove.  It will screech and
holler like you wouldn't believe.  Have fun.

Cliff Parker

Never express yourself more clearly than you can think.  Niels Bohr
----- Original Message -----
From: "Justin Parke" <FIZIX29@AOL.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Tuesday, October 08, 2002 6:33 PM
Subject: arons and dry ice


> I read in arons (sorry don't have the specific reference) earlier today
the
> section on introducing Newton's laws and specifically the concept of
inertia
> and the effects of forces on a body's motion.  He recommends a 50 lb piece
of
> dry ice on a sheet of glass.  (!)
>
> Has anyone done this?  How big is the sheet of glass?  How big is 50 lbs
of
> dry ice?  I am not sure where I will obtain these things but the idea is a
> great one...much better than 1 dimensional pasco carts or even an air
table
> (since the pucks have such low mass).  Are there similar but easier things
> folks have tried?
>
> thanks for the help
>
> Justin
>
> This posting is the position of the writer, not that of SUNY-BSC, NAU or
the AAPT.
>

This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.