Chapter 5, Section 1 Sounds in Vibrating Strings

Do Now What do a piano and a guitar have in common? How do a piano and guitar make different sounds?

February 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 Do Now: – Read Chapter Challenge pg – Write LO and SC on a new left- side page – WDYS/WDYT pg. 484 Agenda: – New Seats – Do Now – Investigate

Investigate Read #1-5 pg Create data table to record data from experiment

February 14, 2012 HW: 5.1 PTG #1-5, pg. 490 Due Wed/Thurs 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: – List your materials you will need for the lab-484

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 20cm cm cm cm1 2 4

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?

Do Now If you were tuning a guitar, how would you make a higher pitch sound and a lower pitch sound?

om/watch?v=LOL8- qIYemg om/watch?v=LOL8- qIYemg om/watch?v=SK52EVv9 xew&feature=related om/watch?v=SK52EVv9 xew&feature=related om/watch?v=5V_hWBR ZKuk&NR=1&feature=fv wp om/watch?v=5V_hWBR ZKuk&NR=1&feature=fv wp om/watch?v=r2BOApUv Fpw om/watch?v=r2BOApUv Fpw om/watch?v=z_lwocmL 9dQ om/watch?v=z_lwocmL 9dQ om/watch?v=fW97Ytog QvE om/watch?v=fW97Ytog QvE om/watch?v=2L8lVLcfJ 0s om/watch?v=2L8lVLcfJ 0s

Physics Talk Read pg Complete 2 column notes in notebook Be sure to define – Vibrate – Variable – Pitch – Frequency

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

PTG #1-5, pg. 490