On Sun, Dec 12, 2010 at 7:06 PM, <rcs@xmission.com> wrote:
A message from Steve Gray ....
--- Date: Sun, 12 Dec 2010 17:16:36 -0800 Subject: Re: [math-fun] Newton's cradle From: "Stephen B. Gray" <stevebg@roadrunner.com>
I don't think anyone has mentioned conservation of energy or momentum. ??
Huh? It's right there in the message you quoted:
On 12/11/2010 11:07 AM, Gary Antonick wrote:
second... in defense of Fred (from very much the layperson view on this) it does seem that given three colliding bodies all you know is that the ending velocities (along with the beginning velocities) will lie on a circle at the intersection of a sphere (kinetic energy) and a plane (momentum). I don't see how this endpoint could ever be
The sphere is conservation of mv^2 and the plane is conservation of mv. -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com