Editing Box of Many Balls (section)

== Why This Works ==

''Collisions'' are an introductory topic in physics, and start with a simple question: is the collision elastic or inelastic? ''Inelastic collisions'' are when the two objects collide, and they do not separate. An example of this is having the metal ball run into the sand-filled ball. ''Elastic collisions'' are when two objects collide, and they bounce off of each other. and example of this is when the tennis ball bounces off the basketball or soccer ball. In every type of collision there is an energy transfer happening between the colliding objects. For an inelastic collision, this means that the two balls combine their energies, and so they stay together because of it. For an elastic collision, the energy is transferred between balls, meaning that they “trade” energy. When we dropped the tennis ball above the bigger ball, the energy from the big ball was transferred into the tennis ball, and sent the tennis ball flying! When we did it with the tennis ball underneath, the energy of the big ball was transferred downward, which sent the tennis ball ricocheting!