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[Phys-L] Re: collision question

Put a cup off coffee on a sheet of paper lying on a table. Pull
the paper out from under the cup quickly. The horizontal forces
between the cup and paper are equal and opposite. The paper moves
a large distance, the cup hardly moves at all.

Bob at PC

-----Original Message-----
From: Forum for Physics Educators [mailto:PHYS-
L@list1.ucc.nau.edu] On Behalf Of John Barrer
Sent: Thursday, February 17, 2005 3:54 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: Re: collision question

--- Bob Sciamanda <trebor@WINBEAM.COM> wrote in part:
SNIP
The interaction forces
operate over a common
temporal interval, but not necessarily over a common
spatial interval.
How are the spatial intervals different?
John Barrere University HS, Fresno, CA