Ball (with string hanging from it)
Steps: put the ball in the middle of the 2 rattles, hit the rattles with a hammer and the ball vibrates
Conclusion: prove that sound is produced by vibration
2
Props: cell phone
Steps: set to vibrate, call and put on a solid to make a sound
Conclusion: vibration makes sound. p>
Conclusion: Vibration makes sound. (Also proves that solids can transmit sound)