In this lesson, suggested for grades K-2, students explore the way pushes and pulls affect the speed and direction of objects using both playground swings and model swings that they build and test. They experiment with swings on the playground and model swings that they build in a STEM challenge. The STEM challenge has the added criterion of working with given materials to develop a successful design. Finally, the development of a class playground model requires students to apply their knowledge of forces and motion to create working models of playground equipment. Before beginning the lesson, we recommend reading Units I and IV, which are included in this book selection. A list of materials, teacher background information, safety notes, standards, assessments, references, and resources are provided. This book selection also includes the Table of Contents, Dedication, About the Author, Acknowledgments, Appendix, and Index.