Everything you need to teach a complete unit on gears, mechanical design, and motor programming with LEGO SPIKE Prime. Unit 4 takes students from the basics of how gears work all the way through building, programming, and refining a Ferris Wheel — culminating in a Capstone showcase. The unit builds deliberately: physical intuition first, then calculation, then design decisions, then code, then refinement. By the end, students can explain why their robot is built the way it is — not just make it