Sometimes my kiddos get stuff out and just start working. Sometimes I document it and sometimes I don't. They found the package of straws that I had just bought, ummm, for drinking. They had a different vision. They went to the supply closet, grabbed all the bottles and just started creating. Most of the time, it really is the simpliest things that gains their interest. I didn't ask what they were doing or what they were building, I didn't ask them anything. Just observed their concentration and creativity.
Let the physics lessons begin!