The guiding questions for this activity are,“How is potential energy stored and how is potential energy converted to kinetic energy?” Different size cup lids are used in this activity to help students with the cylinder for making hall rollers. Students will also learn about potential energy, kinetic energy, and law of conservation of energy. A detailed science beyond the activity is provided. Before beginning this activity, we recommend you read Chapters 9 and 12 which are in this book selection. Chapter 9 is an overview of the section and introduces the format used to present ideas for Family Science Night activities. Chapter 12 features activities that we believe to be advanced level. A materials list, references, safety notes, standards, and teacher background information are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, Introduction, and Index.