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Here is request for help. Responses should be sent directly to Mr.
Youssef, not to Phys-l:

From: "D [iso-8859-1] Isma=EBl Youssouf" <youssouf@univ-lyon1.fr>
Dear Mr,

I am a PhD student at Lyon University (France) and my current work deals
with a historical study of the "hard body", the "elastic body" and the
"soft body" concepts, mainly throughout two contests devoted to the problem
(1668, the London Royal Society contest with Huygens, Wren and Wallis as
contenders, 1724 the Paris Acad=E9mie des Sciences contest with the
participation of Mac Laurin and Bernoulli).

I am also undertaking a whole comparison between these historical
debates and students misconceptions upon the kinematic behavior of "hard",
"elastic" and "soft" bodies during free-fall or collision experiments.

For example, I would like to know

- students definitions of hard, elastic and soft
bodies.
- if for students, hard bodies are able to rebound
after a free fall.
-the link made by the students between matter's
properties (elasticity, hardness, sofness) and the conservation of the
energy.



Unfortunately, I have been able to find only very few relevant
bibliography dealing with these questions. I do not neither know research
groups working on subject near to my own one.

So, I would be very grateful if you could be of some help for me.



Many thanks (and apologizes for my poor English).

Yours sincerely.

D. Isma=EBl Youssouf.


ISMAEL YOUSSOUF Djama
LIRDHIST
Bat 401 D, Universit=E9 Claude Bernard Lyon1
43 Bd du 11 Nov 1918
69622 VILLEURBANNE (FRANCE)
Fax (33) 72 43 15 35- Tel 04 72 44 6251
E-mail: youssouf@cismsun.univ-lyon1.fr





Dick Smith
Department of Physics
The University of West Florida
Pensacola, FL 32514
(904)476-9352
rsmith@uwf.edu
http://www.uwf.edu/~rsmith/