Period and Frequency

The number of cycles that are completed per second is called the ________ and is measured in _________.

• frequency, Hertz

• wavelength, meters

• amplitude, meters

• period, seconds

Frieda the fly flaps her wings back and forth 100 times each second.  The period of her wings flapping is:

• 100 s
• 0.01 s
• 0.01 Hz
• 100 Hz

A tennis coach paces back and forth along the sideline 10 times in 60 seconds.  The frequency of her pacing is:

• 0.167 Hz
• 6.0 Hz
• 0.167 s
• 6.0 s

The Period of circular motion is

• 60 seconds.

• the time it takes to make one revolution.

• half the frequency.

• acceleration.

Which equation is not useful for circular motion?

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What is the period of the second hand on a clock?

• 60 seconds

  
  

• 1 hour

  
  

• 12 hours

  
  

• it depends on the time

  
  

If it takes 50 seconds for an object to travel around a circle 5 times, what is the period of its motion?

• 0.10 s

• 1.0 s

• 5.0 s

• 10 s

If an object is traveling in circular motion and its period is 3.0s, how many revolutions will it complete in 1 minute?

• 15

• 20

• 30

• 60

An object travels around a circle 50 times in ten seconds, what is the frequency (in Hz) of its motion?

• 0.2 Hz

• 2.5 Hz

• 5 Hz

• 10 Hz

If an object is traveling in circular motion with a frequency of 7.0 Hz, how many revolutions will it make in 20s?

• 2.8 rev

• 3.0 rev

• 14 rev

• 140 rev