23.1 Stanford Notes – Waves
MAIN POINTS: Write a summary of the main
point of each paragraph.
Page 554
1)
2)
3)
Name ______________
Questions: Questions you should be able to
answer after reading.
1) What are 3 examples of linear motion?
2) You spin the wheel of your bike and it goes
around 10 times. How many cycles is this?
3) Describe an example of oscillating motion you
would find at an amusement park.
4)
Vocab:
Harmonic Motion:
Cycle:
Page 555
1)
4) State whether the following are linear or
harmonic motion;
i.
Skiing downhill.
ii.
Jumping on a trampoline.
iii.
Hiking uphill.
iv.
Riding a merry go round.
1) Give 4 examples of an oscillator?
2) If a system does not have a restoring force what
type of motion will it have?
2)
3) What is the equilibrium position of your
pendulum in lab?
3)
4) What is the restoring force of your pendulum in
lab?
4)
Vocab:
Oscillator:
Restoring Force:
p. 556
1)
2)
1) Every 5 seconds an oscillator completes 1 cycle.
What is the period and frequency of the
pendulum?
2) The period of an oscillator is 1 minute. What is
the frequency in hertz?
3)
3) A ferris wheel spins 5 times in 10 minutes.
Calculate the period and frequency of the ferris
wheel.
4)
Vocab:
Period:
Frequency:
Hertz:
p. 558
1)
1) A graph of the motion of an oscillator shows that
it swings from +5cm to -5cm for each cycle. What
is the amplitude of the pendulum?
2)
3)
Vocab:
Amplitude:
p. 559
1)
1) Use the graph to answer the below questions:
2)
a. Amplitude:
b. Period:
3)
c. Frequency:
d. Independent Variable:
4)
e. Dependent Variable:
f.
How many cycles are shown:
Fill in the blank:
Wave
oscillator
circular wave
pendulum
restoring force
absorption
plane wave
period
resonance
transverse wave
constructive interference
longitudinal wave
linear motion
natural frequency
refraction
wave front
periodic force
amplitude
destructive interference
harmonic motion
frequency
cycle
reflection
wavelength
diffraction
hertz
1) This kind of force pulls a system back to equilibrium: _____________________.
2) The harmonic motion of a boy on a swing is like the motion of a(n) __________________.
3) A pendulum is a kind of ____________________ in that it has repeating cycles of motion.
4) The note A in the musical scale has a(n) _________________ of 220 Hz.
5) One unit of harmonic motion is called a(n) __________________.
6) The motion of a girl running is called ______________ and the motion of a girl riding a ferris wheel
is called _________________.
7) The formula for _________________ is the inverse of the frequency.
8) One _____________ equals one cycle per second.
Additional Questions
1. How is the force of gravity involved in the motion of a pendulum? Use the words equilibrium and restoring force
in your answer.
2. The motion of an oscillator is related to the interaction of what two factors? Describe each of these.
3. Lab Questions: Describe how you find the amplitude of a pendulum and of a water wave.
4. What information can you learn about the harmonic motion of an object by looking at a graph of its motion?
5. What will happen to the period of a pendulum if you:
a. increase its mass?
b. increase its length?
c. Challenge: increase the amplitude?
Problems:
1. The frequency of an oscillator is 20 hertz. What is its period and how long does it take this oscillator to complete
one cycle?
2. A bicycle wheel spins 25 times in 5 seconds. Calculate the period and frequency of the wheel.
3. The piston in a gasoline engine goes up and down 3,000 times per minute. For this engine, calculate the frequency
and period of the piston.
4. What is the period and frequency of the second hand on a clock? (Hint: How long does it take for the second hand
to go around?)
5. The frequencies of musical instruments range between 20 Hz and 20,000 Hz. Give this range in units of seconds
per cycle.