Ineed with this any is greatly appreciated.
describe a fourth scenario in which either the law of conservation of matter or the law of conservation of energy could be observed. using as many sentences as needed, describe how an experiment could be set up to further explore your recorded observation.
i need with this i'm trying to my little cousin with an assignment that has to be turned in i have no clue where to begin. so all is greatly appreciated in this matter.

About the conservation of energy. Suppose you are in a vacuum and you bunch a basketball. You will notice that no matter how much you will leave the ball bunching the ball will never stop. That happens because the ball develops both potential and kinetic energy, the sum of those two give us the mechanical energy which remains constant. We have to suppose that friction is zero otherwise you have to count for thermal loses. I hope that this is the answer that you were looking for and it has helped you.