, to hit nails into a piece of wood or a wall, or to break things into pieces.
During the collision between two balls on the pool table there is no external force along the line of collision between them
Since there is no external force on it so here we can say

here we have

so we can say

since there is no external force so we can say during the collision the momentum of two balls will remain conserved
The answer to this is aluminum foil.
Cause surface currents to move in circular paths.
Translate please, i’d be able to help better:)