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.
480-481
– Write LO and SC on a new leftside page
– WDYS/WDYT pg. 484
• Agenda:
– New Seats
– Do Now
– Investigate
Investigate
• Read #1-5 pg. 485-486
• Create data table to record data from
experiment
•
•
February 14, 2012
HW: 5.1 PTG #1-5, pg. 490 Due
Wed/Thurs
Learning Objective:
• Do Now:
– Describe the relationship
between pitch, frequency,
tension, and sound.
–List your
– Write a conclusion that includes
materials
you
IV, DV, evidence, and the big
idea.
will need for
Success Criteria:
– Observe the effect of string
the lab-484
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
Length of Vibrating String
(measure from the center
of the cup to the pulley)
# of 500g hanging masses
20cm
1
20cm
2
20cm
4
40cm
1
40cm
2
40cm
4
60cm
1
60cm
2
60cm
4
80cm
1
80cm
2
80cm
4
Pitch (high, medium, low)
High pitch sounds like the
squeal of a vehicle’s
brakes
Low pitch sounds like the
rumble of thunder
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?
• http://www.youtube.c
om/watch?v=LOL8qIYemg
• http://www.youtube.c
om/watch?v=SK52EVv9
xew&feature=related
• http://www.youtube.c
om/watch?v=5V_hWBR
ZKuk&NR=1&feature=fv
wp
•
• http://www.youtube.c
om/watch?v=r2BOApUv
Fpw
• http://www.youtube.c
om/watch?v=z_lwocmL
9dQ
• http://www.youtube.c
om/watch?v=fW97Ytog
QvE
• http://www.youtube.c
om/watch?v=2L8lVLcfJ
0s
Physics Talk
• Read pg. 486-487
• 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