I'm a senior in high school taking AP Physics II, and I was recently elected as the president of my schools Science Club. Our first thing to do is to go to the local elementary schools and give interesting physics demonstrations to the younger students grades K-6. I really enjoy space and I know many children like that too, so I was planning on taking volunteers to be "Planets" and line them to scale to show how far the planets are in comparison to the earth. I was just wondering if there are any other interesting demonstrations for younger children that have to do with space, motion, forces, or anything that they will maybe understand somewhat easily. Thanks!