5*1 Sounds in vibrating strings WDYS??? (p484) . WDYT??? Guitarists make different sounds by _____. The “air guitarist” makes a HIGH PITCH note by _____.

5*1 Investigate (p484) Set up materials: Pully, 500g mass, String, Plastic Cup, and Clamp Draw the picture Measured LENGTH of VIBRATING string:_____ Pluck the string and listen to the sound at the cup-opening, is it HIGH or LOW in pitch?

5*1 Investigate (p484) ***Mass is constant at 500g*** 4 b) The pitch becomes _____ as the length of the vibrating string gets SHORTER Length of String Pitch (Low, Medium, High) 1. 2. 3. 4.

5*1 Investigate (p484) 5. ***Length is constant at _____*** 6b) As the tension of the string is increased, the pitch of the vibrating string _____. Mass on Pully Pitch (Low, Medium, High) 1. 500g 1. 2. 1000g 2. 3. 1500g 3. 4. 2000g 4.

5*1 physics talk (p486) “changing the pitch” To produce a sound, something must vibrate In the Investigate, we studied 2 variables, length and tension Pitch  how HIGH or LOW a note is Shorter string = _____ pitch Longer string = _____ pitch ***Therefore, change is length = change in pitch***

5*1 physics talk (p486) “changing the pitch” Adding mass to the string, increased the tension Less mass = Less tension = _____ pitch More mass = More tension =_____ pitch HIGH Pitch  Increase the tension Decrease the length

5*1 Checking up (p487) The pitch of the sound _____in a string as its tension increased. Decreasing the length of a string _____ the pitch of the sound produced by an instrument. Adding mass in the Investigate _____ the tension on the string. In percussion instruments, sound is produced by _____.

Physics to go (p490) a) You can change the tension in a vibrating string by _____. b) Increasing the tension _____ the pitch of the sound produced by the string. a) The string is shortened by _____. b) Decreasing the length of the string _____ the pitch of the sound. a) If the tension is _____, the string length should also _____ to keep pitch the same. b) If the length is _____, the tension should also _____ to keep the pitch the same.

Physics to go (p490) 4. a) If the tension was _____ and the length _____ by an equal amount, the pitch would change. 5. a) The guitarist plays different notes by _____. b) For both instruments, the pitch is adjusted by changing the _____. 6. a) These knobs are used to change the _____. b) Increasing the tension _____ the pitch, while decreasing the tension _____ the pitch.