Post on 24-Dec-2015
transcript
+The “Screaming” Balloon
What made the balloon “scream”?
Key Question: What is sound, how is it made and
transferred?
+Tuning Fork & Ping Pong Ball
DO NOT HIT THE TUNING FORK ON YOUR DESKS. ONLY USE THE PALM OF YOUR HAND.
One group member hit the tuning fork, another touch the ping pong ball to the tuning fork
Be sure to make a prediction before you start the experiment
Let each member of the group give it a try
+Tuning Fork & Water
Hit the tuning fork (again only using your palm) and place it in the water
Be sure to only put the tuning fork in about half an inch
Don’t touch the tuning fork to the side of the glass, this will mess up your results
+The “Clucking Chicken”
Be careful with how you pull on the string
Try it first without wetting the sponge, holding the cup
Then try it with a wet sponge, holding the cup
Then, while also using a wet sponge try it holding the string and not the cup
+Pitch
Pitch makes a sound “high” or “low” Depends on frequency
Objects with less matter vibrate faster Faster vibration = Higher frequency
Higher Frequency = Higher pitch
Objects can vibrate or the air inside of them, this affects the kind of pitch you get.