Physical Setting - Science Worksheet Page 21
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28Base your answers to questions 70 through 73 on the data table below and on your knowledge of Earth
science. The data show the rate of change in the apparent direction of the swing of a Foucault pendulum at
various latitudes on Earth, in degrees per hour.
A Foucault Pendulum’s Swing
Latitude
Rate of Change in Apparent
(°)
Direction of Swing (°/h)
0
0.0
10
2.6
20
5.1
30
7.5
40
9.6
50
11.5
60
13.0
70
14.1
80
14.8
90
15.0
70 On the grid in your answer booklet, plot the hourly change in a Foucault pendulum’s apparent direction of
swing at the latitudes shown on the data table. Connect the plots with a line. [
]
1
71 Calculate how many hours are needed for a Foucault pendulum located at the North Pole to complete
a 360° change in its apparent direction of swing. [
]
1
72 If a Foucault pendulum were set up on Mars, it would most likely show similar changes in the pendulum’s
apparent direction of swing. Identify the motion of the planet Mars that would cause this change. [
]
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73 The Coriolis force results from the same motion that causes the Foucault pendulum to change its apparent
direction of swing. The diagram below represents the relative strength of the Coriolis force acting on air
moving over Earth’s surface.
North Pole
Deflection to right
No deflection
Equator
Key
Direction of
air motion
Strength of
Coriolis force
(indicated by
Deflection to left
the length of
the arrows)
South Pole
Describe how the strength of the Coriolis force changes with latitude. [
]
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[21]
[OVER]
P.S./E. Sci.–Aug. ’15
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