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Tidal force on oceans

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Tidal force on oceans. Highs and Lows. Generally- 2 high tides per day, 2 low tides per day ... Orbit of moon means next day will move these tides to 45 minutes ... – PowerPoint PPT presentation

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Title: Tidal force on oceans


1
Tidal force on oceans
2
Highs and Lows
  • Generally- 2 high tides per day, 2 low tides per
    day
  • Orbit of moon means next day will move these
    tides to 45 minutes later
  • Diagram of tides.swf

3
Spring and neap tides
4
Extreme tide at Bar Harbor, Maine
5
Effect of tides
  • Earth rotates faster than the moon orbits, thus
  • tidal bulge dragged back towards the moon
  • tidal bulge pulls the moon ahead (accelerating
    it)
  • Consequences
  • Earths rotation period slows currently at
    roughly 0.002 seconds per century (day length
    increases about 1 hour per 200 million years
    currently)- earliest dinosaurs had a 23 hour day
  • Moon distance increases 3.5 cm per year
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