How do the vibrations of the different sounds compare for higher vs lower pitch notes?
- Do Now– Copy down homework in your planner. Get out your ISN and open to page 28. Read your conclusion to your cooperative table group. Did you agree or disagree about why different objects produce sounds of different pitches?
- Scientists’ Circle (Building Understandings)- Point out features and patterns from observations of graphs for both conditions. Calculate highest amplitude of waves and frequency of waves on both graphs. What do you predict would happen to the frequency of vibration waves if we made the stick shorter and struck it just as hard? What if we made the stick longer? Think back to what you know about how the needle and the record surface interact. What about that interaction might help explain how it could be producing so many different sounds (with different pitches and different volumes) at different points on the record?
- Notebook work– Tape handout as flip page to ISN p.29
- Student Graph Analysis– handout
Complete Student Graph Analysis handout