Until this point, we have dealt with objects as point masses, or as if all forces acted on a single point in the body. However, that is a very rare situation. You may have experienced situations where you land wrong after a jump, or moved too quickly in a new direction. This creates a "twist" in your body which can really hurt! The reason is that your center of mass is NOT over your foot, or knee, and your body has to balance that by putting more stress on your foot or knee, often in a way which is uncomfortable. Examples you may have encountered include tennis elbow, torn ACL tendons, twisted ankles, and many more. We will explore torques more in the next module, but let's start this discussion with using what we know, ourselves, to better understand rotation. The good news is, the same fundamental principles that applied to constant linear acceleration, also apply to rotational motion. So all we need to do is apply what we have learned to a broader set of situations, namely when rotation is involved. Time Spent on Lab = Two hours, do not need to complete the lab at one sitting Materials