As part of the Science United Festival, we conducted two physics experiments with the participation of approximately 15 students, named “Rainbow”. The first experiment concerned kinetic energy, based on Newton’s third law, action and reaction, while the second experiment was about the conversion of potential into kinetic energy. The students painted flags from their countries, reinforcing the sense of cooperation and multiculturalism. The experiments were implemented with the help of teachers: Vayiou Aikaterini (PE02), Douna Vasiliki (PE02) and Pipinti Maria (PE04).