1. Keeping your mouth tightly closed, hum a long note. Place your hands on the sides of your throat and describe what you feel.

2. Hold your mouth as if you are going to whistle. Again, hum a long note and describe the feeling of your lips.

3. Attach one end of the thread to the ring stand. Using the tack, attach the cork to the other end of the thread. Strike the tuning fork with the mallet and bring it very close to the cork but do not touch the cork. What happens to the cork?

4. Cut a piece of paper 2 ½ inches long and ½ inches wide. Hold the paper between your thumbs and blow on it . Record your observations.

5. From your observations in the last activities, make a general statement about the type of motion that causes sound.