For Project Based Instruction, I taught a unit on the physics of motion at Austin High School. The project involved launching water bottle rockets at the football stadium and analyzing their motion to determine the equations and graphs governing the vertical component of motion under the influence of gravity. The driving question was, "How can you make a bottle rocket reach the most height?"
As a project as part of the course, I designed the Physics component of an interdisciplinary PBI unit (composed of Pre-Calculus and Physics). It draws inspiration from a pivotal event that triggered the birth of modern science: the discovery of the moons of Jupiter by Galileo. It involved analyzing the motion of the moons of Jupiter by bringing together uniform circular motion and Newton's law of universal gravitation (and concepts from Pre-Calculus math).
The driving question was, "How, and why, do moons orbit planets?"