A attouchement résistance is any puissance that requires effleurement to occur. If two surfaces are not in attouchement, they can’t exert a habituel résistance je each other. When two bodies collide ravissant there is no loss in the overall kinetic energy, it is called a perfectly elastic collision. Elastic Collision https://fetzner-collision.blogchaat.com/29125930/fetzner-collision-rochester-s-initial-autobody-repair-chevronné-since-1948