How Does Energy Work Investigating Investigating Investigating Sound Sally M Walker Lerner Publications Minneapolis
chapter 1 WHat IS SounD We like some sounds better than other sounds What do we call sounds that bother us Clap your hands Whisper your name What do you hear You hear a sound Some sounds are nice to hear But a sound like a fingernail scraping a chalkboard bothers many people We call sounds that bother us noise 4
This excavator is part of a noisy construction site Animals make sounds So do machines The wind blowing through trees makes a sound What causes sound Sound begins when an object moves back and forth very quickly The movements are called vibrations 5
