Make an Astronaut Lander
Use what you know and what you can investigate about gravity, motion, forces and a target of your choosing (the Moon, Mars or beyond!) to design and build a lander that will protect two 'astronauts' when they touch down. You could compare your craft to a friend's.
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There are more details for using this activity in the classroom here: https://www.jpl.nasa.gov/edu/teach/activity/touchdown/