1. Steel or Plastic? http://youtu.be/0D2o8F2MOuI Your group will have to explain what type of pipe is better.

2. Steel Steel is iron with more carbon in it than regular iron. It is much stronger and more flexible (it doesn't break as easily). People first began making a kind of steel in India, around 250 BCcarbonIndia250 BC

3. Size of pipes

4. Plastic All plastics are groups of hydrocarbon molecules. Each of these molecules is very large with tens of thousands of carbon atoms and hydrogen atoms in it.hydrocarbon molecules carbon atomshydrogen atoms

5. Question How does the length affect the noise heard from the pipes? How does type of pipe affect the noise heard?

6. Vibration Is a repeated back and forth motion

7. Pitch High or low pitch The frequency of vibration Low pitch= Truck High pitch= birds chirping

8. Frequency The amount of times the back-and-forth movement occurs in a second.

9. What can you test? How will you test this?