Why is your desk smooth? Why is sandpaper rough? What is friction? This engaging title invites curious readers to discover the answers to these questions. Vibrant photographs and accessible text encourage readers to investigate how smooth and rough materials are used in everyday life. Contents: What is matter? -- Smooth and rough -- What is smooth? -- What is Rough? -- Which textures help? -- Bedtime things -- Friction -- Friction outside -- Inside and outside -- What do you think?Interest Level: K-3 Reading Level: 2.1 Lexile Measure: 470 Guided Reading Level: K.