This unit contains some of my products bundled together for a discount! This contains all my Balloon car challenges: Challenge #1, #2, and #3. These challenges allow students to discover how and why objects move, calculate the speed of moving objects, collect and graph data, analyze Newton's Laws of motion, and work through the engineering cycle. All of this is done through the construction, revision, and testing of balloon cars! The great thing is they can be constructed from simple materials, even trash. Also included is an introductory investigation into motion, which gets students asking questions and formulating mini tests and experiments. As a bonus I included my gravity and friction campaign poster project, which is a fun and creative way to get students to think about these two important forces. All of these lessons are hands on, student centered, and NGSS approved!