In order to keep this extra period organized and easy prep, I've created some Mystery Bag challenges that I will use each week with my students. These challenges are also perfect for fun Fridays, morning work, classroom parties, and more. I feel they are extremely flexible for grade levels. Don't have all the supplies on hand? Just use what you have! I've included the file for these challenges and some photos that make it self-explanatory!
I gave them 15 minutes to complete and test their launchers. Then we went in the hallway and had a small contest to see which group's launcher was most successful! You can see one group's launcher below.