Date: Sat Aug 22 09:49:19 2009 Back to Contents ------------------------------------------------------------------------

Author: John Hubisz

Subject: Re: Happy - Sad Ball sets

Post:

In the early 1960s I got six sets of these four balls, one each of: cis
polybutadiene (red), polysar krylene (green), natural rubber (yellow),
and polysar butyl (blue) from Polymer Corporation Limited. They are an
excellent physics demonstration for coefficient of restitution and I
would like to find a source for more as I am down to one set. Any help
that you might be able to provide would be appreciated.

I have mentioned it to Arbor Scientific.

John Hubisz

Bernard Cleyet wrote:
> Perhaps someone would forward this thread to Sci. 1st?
>
> bc lazy.
>
>
> On 2009, Aug 21, , at 11:45, Dick Heckathorn wrote:
>
>> Greetings,
>>
>> Arbor Scientific has had good ones in the past.
>>
>> Dick
>>
>> -----Original Message-----
>> From: tap-l-owner@lists.ncsu.edu
>> [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of
>> Dale E. Stille
>> Sent: Friday, August 21, 2009 10:05 AM
>> To: tap-l@lists.ncsu.edu
>> Subject: [tap-l] Happy - Sad Ball sets
>>
>> Tappers,
>>
>> Just got in some Happy-Sad ball sets # 611-0380
>> that I had ordered from
>> Science First. What a disaster. The Happy ball
>> only bounces about 4
>> inches back up when dropped from a couple of feet
>> high, and the Sad ball
>> bounces about 2 inches high and 2 or 3 times after
>> hitting the table.
>> Basically they are both somewhere between happy
>> and sad....... but not
>> showing either.
>>
>> You've been warned.
>>
>> Dale Stille
>> U of Iowa
>>
>>
>

From tap-l-owner@lists.ncsu.edu Sat Aug 22 09:49:19 2009

Back