... speed and/ or direction. As you walk to class, you may realize you arelate and pick up your pace. An airplane landing at an airport must decreaseits altitude and slow its speed as it lands and ... fromfalling leaves and tumbling rocks, to moving people and speeding cars, tojet planes, orbiting space satellites, and planets. Understanding what mo-tion is, how it can be described, and why it occurs, ... Expose their ideas and results toindependent testing and replica-tion by other scientists. This re-quires the complete and open ex-change of data, procedures, and materials.2. Abandon or modify...