Sound happens when an object vibrates. Vibrate means to move quickly back and forth. Any object that vibrates can make a sound. A vibrating object sends out sound waves. The sound waves make our earbones vibrate so that we can hear. 1. Vibrate an object. Take a photo. Record the sound with the voice option. 2. Repeat 3 more times. 3. Illustrate how sound travels. 4. Click the green check to save.