Friction is very common and experienced every day. It is a force that pushes on things and that you notice when two objects’ surfaces are in contact with each other. Air resistance is a force that occurs because moving objects hit the air in front of them and have to push the air out of the way. It is experienced when you ride your bicycle as you feel the air blowing against your face. In this chapter, the experiments explore these important everyday phenomena. Teacher background information, assessment, safety notes, references, and additional resources are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, An Introduction to Phenomenon-based Learning, Appendix, Image Credits, and Index.