Particle Motion Project-Based Assessment (MS-PS1-4)Popcorn Balloon InvestigationLooking for an engaging, hands-on way to assess student understanding of particle motion and thermal energy? This project-based assessment uses the high-interest Popcorn Balloon Investigation to help students model and explain how adding thermal energy affects particle motion and causes matter to change. In this investigation, students must create a particle-level model to explain what is happening inside the ball