Physics 100 Lab Pendulum Period

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Physics 100 Lab Pendulum Period Frequency

• Name Date

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• Measure pendulum period and frequency with
• - varying amplitude (10o, 20o)
• - varying length (100 cm, 50
  cm, 25 cm), and
• - varying mass (small and large).
  
• Use the table provided for your data.
• Period, T, is the time for the pendulum bob to
  swing back and forth, in other words, the time
  for the bob to return to its starting location.
  Measure time taken for the bob to swing back and
  forth 20 times. Period
• equals this time divided by 20.
• Frequency, f, is the number of back and forth
  bob motions per second, in other words, the
  number of periods per second. The unit for
  frequency is s-1 or Hz. Here are 2 ways to get
  frequency
• 1. Measure period, T, and calculate the
  reciprocal to get frequency
• f 1/T
• Measure the number of back forth motions
  (periods) in 20 seconds, say. Divide this
  number by 20 to get frequency.
• Determine frequency using both of the above
  methods there is a column for each method in
  the data table.

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Answer these questions

• 1. Increasing pendulum bob mass
  increases/decreases/does not affect pendulum
  period.
• 2. Increasing pendulum length increases/decreases
  /does not affect pendulum period.
• 3. If pendulum frequency increases, pendulum
  period decreases. T/F
• 4. Increasing pendulum amplitude noticeably
  increases/ noticeably decreases/does not affect
  pendulum period.
• 5. Consider 2 identical pendula, E on the Earth,
  and M on the Moon. The period of E is less
  than/ greater than/equal to the period of M.
• 6. Air resistance has absolutely no effect on
  pendulum period. T/F

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Pendulum Vocab
Note Choose d as follows to get Q
L length (m) M bob mass (kg) Q amplitude
(degrees)
Q
L
M
d
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