1. Chapter 5, Section 1 Sounds in Vibrating Strings

2. 2/13/2012 HW: 5.1 PTG #1-5, pg. 490 Due Wed Learning Objective: – Describe the relationship between pitch, frequency, tension, and sound. – Write a conclusion that includes IV, DV, evidence, and the big idea. Success Criteria: – Observe the effect of string length on the pitch of the sound produced – Observe the effect of tension on the pitch of the sound produced – Control the variables of tension and length – Summarize experimental results New Seats Do Now: – Read Chapter Challenge pg. 480-481 – Write LO and SC on a new left- side page – WDYS/WDYT pg. 484 Agenda: – New Seats – Do Now – Investigate

3. Investigate Read #1-5 pg. 485-486 Create data table to record data from experiment

4. Length of Vibrating String (measure from the center of the cup to the pulley) # of 500g hanging masses Pitch (high, medium, low) High pitch sounds like the squeal of a vehicle’s brakes Low pitch sounds like the rumble of thunder 20cm1 2 4 40cm1 2 4 60cm1 2 4 80cm1 2 4

5. Summary – Record Answers in Notebook When you increase the mass (add weights) to the string, the tension on the string increases. What happens to the pitch? When you increase the distance between the cup & the pulley, but keep the mass the same, what happens to the pitch?

6. 2/14/12 HW: 5.1 PTG #1-5, pg. 490 Due Wed Learning Objective: – Describe the relationship between pitch, frequency, tension, and sound. – Write a conclusion that includes IV, DV, evidence, and the big idea. Success Criteria: – Observe the effect of string length on the pitch of the sound produced – Observe the effect of tension on the pitch of the sound produced – Control the variables of tension and length – Summarize experimental results Do Now: – Look at your conclusion for 6b from yesterday. Does it have: IV and DV Evidence/Data Big Idea – What happened to the pitch as you changed the length of the string? – What happened to the pitch as you changed the mass on the hanger?

7. http://www.youtube.co m/watch?v=LOL8-qIYemg http://www.youtube.co m/watch?v=LOL8-qIYemg http://www.youtube.co m/watch?v=SK52EVv9xew &feature=related http://www.youtube.co m/watch?v=SK52EVv9xew &feature=related http://www.youtube.co m/watch?v=5V_hWBRZKu k&NR=1&feature=fvwp http://www.youtube.co m/watch?v=5V_hWBRZKu k&NR=1&feature=fvwp http://www.youtube.co m/watch?v=r2BOApUvFp w http://www.youtube.co m/watch?v=r2BOApUvFp w http://www.youtube.co m/watch?v=z_lwocmL9d Q http://www.youtube.co m/watch?v=z_lwocmL9d Q http://www.youtube.co m/watch?v=fW97YtogQvE http://www.youtube.co m/watch?v=fW97YtogQvE http://www.youtube.co m/watch?v=2L8lVLcfJ0s http://www.youtube.co m/watch?v=2L8lVLcfJ0s

8. Physics Talk Read pg. 486-487 Complete 2 column notes in notebook Be sure to define – Vibrate – Variable – Pitch – Frequency – http://www.freemosquitoringtones.org/

9. Essential Questions-pg. 489 In your notebook answer the – What does it mean? – How do you know? – Why should you care? Be prepared to discuss in your group

10. PTG #1-5, pg. 490