Perhaps you are not familiar with nerf balls. Nerf balls are foam
rubber. When a cue ball hits a nerf ball (sufficiently large) nerf
ball it stops and the nerf ball just quivers a bit. The center of
mas quits moving. The kinetic energy of the cue ball has been
converted to heat. Energy is conserved, momentum is not.

There is more to that. If this collision occurs in outer space, I
guarantee you that the center of mass will =not= quit moving.

On a pool table, friction with the table is involved, (as is to some
extent rolling moment). The nerf ball starts its quiver in the
direction the cue ball was going. If there is not enough force in the
quiver to break starting friction, then the momentum gets imparted to
the table (and the entire earth, which has no problem absorbing it).

Jose
--
Money: what you need when you run out of brains.
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