This packet by Suzanne Buras, "Race to the Earth: Gravity and Air Resistance Lab," has students testing if mass affects the rate of acceleration when an object is falling. Using different objects dropped at the same time, students will learn that mass does not affect the rate of acceleration, but when air resistance, it appears that it does. The packet includes the complete procedure, step-by-step, following the Scientific Method. It also includes a poster of Gravity and Air Resistance and a sheet of "Scoring Slips" for grading participation. I hope your students will enjoy the activity and that it will be an "Aha!" moment for them!