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Tides

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12 diapositives · 516 Views · Jul 10, 2014

Tides. EW Chapter 4.2 Pages 123-126. Cause of Tides Page 123. What are Tides? Describe the 2 types of Tides. What objects and force cause Tides? Draw a picture of the location of the tidal bulges like the one on Page 123. Cause of Tides Page 123. What are Tides?

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Tides
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  1. Tides EW Chapter 4.2 Pages 123-126

  2. Cause of TidesPage 123 • What are Tides? • Describe the 2 types of Tides. • What objects and force cause Tides? • Draw a picture of the location of the tidal bulges like the one on Page 123.

  3. Cause of TidesPage 123 • What are Tides? • Daily rise and fall of water on coastlines • Describe the 2 types of Tides. • High tide is when water reaches its highest point, Low tide the lowest point • What objects and force cause Tides? • The gravity from the moon causes tides (Sun, too) • Draw a picture of the location of the tidal bulges like the one on Page 123.

  4. Daily Tidal CyclePage 124 • How often do tides occur? • What factors affect the height of the tide?

  5. Daily Tidal CyclePage 124 • How often do tides occur? • High tides occur about ever 12 hours & 25 minutes • What factors affect the height of the tide? • Landforms (capes, islands), depth and speed of water.

  6. Cape Cornwall, UK

  7. Cape Canaveral, FL

  8. Tidal Cycle124-125 • What is Spring tide? • Draw a picture of the alignment of the Earth, Moon & Sun to illustrate. • What is Neap tide? • Draw a picture to illustrate.

  9. Tidal Cycle124-125 • What is Spring tide? • Greatest range between low & high tide • Draw a picture of the alignment of the Earth, Moon & Sun to illustrate. • What is Neap tide? • Least difference between high & low tide • Draw a picture to illustrate.

  10. Tidal Energy125-126 • Explain how tides can be used to create electricity. • Why is this system not always useful? • If you were the captain of a ship, why would it be useful to know the time of the tides?

  11. Tidal Energy125-126 • Explain how tides can be used to create electricity. • During high tide, water floods into a basin. As the water retreats during low tide, it spins turbines to produce electricity • Why is this system not always useful? • Only works in locations where tide difference is large and energy must be stored for when needed.

  12. Tidal Energy125-126 • If you were the captain of a ship, why would it be useful to know the time of the tides? • So you know when a port is / is not accessible and do not run aground