ABSTRACT
Consider again the 17-member human body model of Chapters 6, 8, and 11 and as shown again in Figure 12.1. Suppose this model is intended to represent a person in a force eld. For example, we are all subject to gravity forces-at least on the Earth. In addition, a person may be engaged in a sport such as swimming where the water will exert forces on the limbs and torso. Alternatively, a person may be a motor vehicle occupant, wearing a seatbelt, in an accident where high accelerations are occurring. Or still another example, a person may be carrying a bag or parcel while descending a stair and grasping a railing.
