Friction (True Books: Physical Science) by Matt Mullins

What Is Friction? (Rookie Read-About Science) by Lisa Trumbauer

Why Do Moving Objects Slow Down?: A Look at Friction by Jennifer Boothroyd

Drag! Friction and Resistance by Stephanie Paris

Friction and Gravity: Snowboarding Science by Marcus Figorito

Friction (Our Physical World) by Ellen S. Niz