Please check out the video I posted on TPT about this project. In addition, the rubric I included will explain more in depth what I expected from students. This project includes an egg drop and building a wind-powered car. However, I incorporated both into our study of Mars and outer space, so I called the egg drop a "Mars Descent Vehicle" and the car a "Rover." This project spanned over 5 days and this download includes the rubric which I used to grade students!