Collision of four balls aligned
Abstract
The collision of four balls aligned is analyzed in this paper.This study is based on the fundamental idea that a system formed
by rigid bodies is deformable, since its shape changes because the
relative distances of the different bodies change. A simple linear
constitutive law, described by a pseudo-potential of dissipation
completed by the condition of the impenetrability between the
balls, is used. we consider the case where three balls falls on a
very massive obstacle. The first ball, considered of very light
mass, bounces with a velocity extensively superior to its fall
velocity. This is sometimes called the superball phenomenon.
This phenomenon is produced according to different cases such as
the interaction between the first ball and the massive obstacle
must be presented. Introducing an interaction between the first
ball and the massive obstacle through the second or the third
ball, the superball phenomenon is produced for all cases of
evolutions after the collision. For every cases of evolutions of
the balls after the collision, has been investigated the relations
on the physical parameters which insure the superball phenomenon.
These relations are obtained on the basis of the fundamental
hypothesis: the mass of the first ball is very small whereas the
mass of the massive obstacle is very large.