Catapult

For starters, aim to do this project out of doors.
Particularly out of rooms with rice paper lamps!

This simple catapult encompasses some science as well as simple engineering, plus it's cheap and takes two minutes to prep before you can make objects soar!
https://gosciencegirls.com/upcycled-catapult/

After a couple of rounds of being whacked on the noodle by landing wooden blocks, Ms. O developed a new foot-press technique, eliminating the risk of bring hit by your own missiles.