Changes

| style="height:20px; width:300px; text-align:center;" |When you hit a drum hard, it makes a louder '''sound ''' because the [[Vibrate|vibration]] is bigger.| style="height:20px; width:300px; text-align:center;" |When you pluck a guitar string harder, it makes a louder '''sound ''' because the [[Vibrate|vibration]] is bigger.| style="height:20px; width:300px; text-align:center;" |Blow harder down a tube it makes a louder '''sound ''' because the [[vibration]] is bigger.