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Lecture 20: Tides
Why are there two high tides a day? This lecture examines tides caused
by the differences in the gravity force of the Moon from one side to the
other of the Earth (stronger on the side nearest the Moon, weaker on the
side farthest from the Moon). The Sun raises tides on the Earth as
well, about half as strong as Moon tides, giving rise to the effect of
Spring and Neap tides that correlate with Lunar Phase. We will also
discuss body tides raised on the Moon by the Earth, and how that has led
to Tidal Locking of the Moon's rotation, which is why the Moon always
keeps the same face towards the Earth. We end with a discussion of the
combined effects of tidal braking of the Earth, which slows the Earth's
rotation by about 23 milliseconds per day century, and causes the steady
Recession of the Moon by 3.8cm away from Earth every year. Tidal
effects are extremely important to understanding the dynamical evolution
of the Solar System, as we'll see time and again in the second half of
the class. Recorded 2007 Oct 17 in 1000 McPherson Lab on the Columbus
campus of The Ohio State University.
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By Richard Pogge
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8080 ratings
Why are there two high tides a day? This lecture examines tides caused
by the differences in the gravity force of the Moon from one side to the
other of the Earth (stronger on the side nearest the Moon, weaker on the
side farthest from the Moon). The Sun raises tides on the Earth as
well, about half as strong as Moon tides, giving rise to the effect of
Spring and Neap tides that correlate with Lunar Phase. We will also
discuss body tides raised on the Moon by the Earth, and how that has led
to Tidal Locking of the Moon's rotation, which is why the Moon always
keeps the same face towards the Earth. We end with a discussion of the
combined effects of tidal braking of the Earth, which slows the Earth's
rotation by about 23 milliseconds per day century, and causes the steady
Recession of the Moon by 3.8cm away from Earth every year. Tidal
effects are extremely important to understanding the dynamical evolution
of the Solar System, as we'll see time and again in the second half of
the class. Recorded 2007 Oct 17 in 1000 McPherson Lab on the Columbus
campus of The Ohio State University.
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