What are tides Tides are the daily changes in the level of ocean water What causes tides Tides are caused by the difference in the gravitational force of the sun and the moon What is tidal force ID: 805872
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Slide1
Tides Notes
Key Question: What causes tides?
Slide2What are tides?
Tides are the daily changes in the level of ocean water.
Slide3What causes tides?
Tides are caused by the difference in the gravitational force of the sun and the moon.
Slide4What is tidal force?
Tidal Force: the difference in gravitational force
The tidal force exerted by the moon is stronger than the tidal force of the sun.
The moon is closer so it exerts more gravitational pull than the sun does.
Animation
Slide5High Tides and Low Tides
High tide is when the water level is higher than the average sea level.
Low tide is when the water level is lower than the average sea level.
Slide6What are tidal ranges?
A tidal range is the difference between the levels of the ocean water at high tide and low tide.
Slide7Spring Tides:
The largest tidal range
Occur during new and full moon when the sun and moon are aligned
The gravitational pull of the moon and sun add together and cause one pair of very large tidal bulges.
Slide8Spring Tides
Higher high tides and lower low tides
Slide9Neap Tides
The smallest tidal rangeOccur when the moon and the sun are at 90° angle to each other.
Occur during the 1
st
and 3
rd
quarter phases
The sun pulls water one way , the moon pulls water the other way
Slide10Neap Tides
Low high tides and high low tides
Slide11What causes tidal cycles?
The Earth’s rotation and the moon’s revolution around Earth determine when tides occur.
The moon revolves slower than Earth rotates so the tides occur 50 minutes later each day.
There are about 6 hours between high tide and low tide.
There are about 12 hours between two high tides or two low tides.