This problem focuses on force, acceleration, direction, and mass, and is set in the context of a rescue team. Students figure out how to balance three forces to suspend a person in a particular position. They balance three forces of different strengths and directions to produce a stabilizing net force of zero. The forces are set in a horizontal plane, so gravity is not one of the forces. For students with strong spatial reasoning and mathematical skills, the problem could be redesigned to take into account the vertical force of gravity. The training simulation can be set up with the crevasse designated by a line of tape on the floor or on a desk. To make a more realistic simulation, the crevasse can be represented by a narrow gap between two tables. A materials list, teacher background information, safety practices, assessment, and outcomes are provided. This book selection includes the Table of Contents, Preface, Catalog of Problems, Acknowledgments, About the Authors, Image Credits, and Index.