The purpose of this activity is to allow students to think critically to answer a seemingly simple question. In this case, it’s answer an old idiom that says that everything that goes up, must come back down. You can either examine that question literally (which is what this experiment covers), or the students can look at this question figuratively (does all success come crashing down?). The students will need to use the scientific method to determine a way to answer that question. They will also need to design a test to empirically show that all objects that leave the ground will return to the ground.
This is a very basic experiment with a predictable outcome, but it gives students the opportunity to think more about the process of the scientific method and how to obtain your answers. Additionally, it lends to a lot of discussions/debates about what exactly constitutes as "anti-gravity" and "forces against gravity."