What celestial object is attracted to the Earth The Moon What celestial object is the Earth attracted to The Sun Effect of the moon on the Earth The Moons gravity also pulls on the Earth but because the Earth is solid it doesnt seem to respond ID: 805875
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Slide1
Tides
Slide2Gravity
Remember, gravity is an invisible force of attraction between two objects.
What celestial object is attracted to the Earth?
The Moon
What celestial object is the Earth attracted to?
The Sun
Slide3Effect of the moon on the Earth
The Moon’s gravity also pulls on the Earth, but because the Earth is solid, it doesn’t seem to respond.
However, the Earth is mostly covered with water. Water is a liquid and does respond to the pull of the Moon. This response creates tides.
Slide4Tides
The how and why of tide formation is very complex.
This presentation will try to simplify how and why tides form.
To do this….
Slide5Imagine that there is nothing
but water covering the Earth.
Slide6Now, imagine looking at the Earth from above the North Pole.
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Slide7Let’s add the moon to this system.
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Slide8The moon pulls on the water
.
This creates a bulge.
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Slide9But because the Earth is spinning, there are actually 2 bulges created.
You’ll learn more about this in a course called Physics.
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Slide10This bulge of water follows the moon as it orbits the Earth
.
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Slide11It takes the moon about 28 days to revolve around the Ear
th.
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Slide12This makes the times that the tides occur change in a predictable pattern
.
Slide13But there is more going on than just the revolution of the moon around the Ear
th .
The Earth
rotates every
day.
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Slide14Let’s put a person on the equator of the Earth.
Remember,
you are looking at the Earth from the North Pole, so this person appears to be on the edge of the Earth.
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Slide15As the Earth rotates, the person will move through two very high bulges of water and two areas of low water each day
.
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Slide16We call these areas high tide and low tide.
Remember,
in a 24 hour period of rotation,
there are
two
high tides and
two
low tides.
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Slide17This is what it looks like with both motions.
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Slide18Spring Tides
When the Sun, Earth, and Moon are in a straight line- the variation between high tide and low tide is greatest. This occurs during the full moon and new moon.
High Tide
Low
Tide
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Slide19Spring Tides
Greatest difference between high and low tides.
Sun, moon and earth are in a straight line.
S M E or S E M
Slide20Neap Tides
When the Sun, Earth, and Moon are in a perpendicular arrangement- the variation between high tide and low tide is not great. This occurs during the first and third quarter moon.
High Tide
Low
Tide
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Slide21Neap Tides
Least difference between high and low tide.
Sun, moon and earth are at right angles
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S E or S E
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