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Tides

Tides. What is a tide. TIDE: A periodic short-term change in the height of the ocean surface at a particular place. A tide is one huge _______________. When the high part, or of the wave reaches a particular location, _______ tide occurs.

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Tides

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  1. Tides

  2. What is a tide • TIDE: A periodic short-term change in the height of the ocean surface at a particular place. • A tide is one huge _______________. • When the high part, or of the wave reaches a particular location, _______ tide occurs. • _____________ tide corresponds to the lowest part of the wave, or its ________________. wave crest high low trough

  3. What Causes Tides? • Tides are created by the imbalance between two forces • 1. Force of the Moon and Sun on earth. • 2. Force (center-seeking) required to keep bodies in nearly circular orbits. Gravitational Centrifugal

  4. Gravitational forces on Earth due to the Moon G = m1m2 __________________ r • Equation: ____________ • Force is directed toward the moons center of mass. • High tide occurs on side of earth closet to the moon. • Force _____________ with increasing distance. decreases

  5. Centrifugal Force Outward • _______________ force associated with curved motion. • Force that keeps water in bucket when you swing it around. • Causes high tide on side of earth _____________ to the side of moon. opposite

  6. How many high/low tides a day? 15 • The earth spins on its axis ________ degrees every hour. • As earth rotates, it goes into different bulges which cause high and low tides. • There are roughly _______ high tides and ________ low tides a day. 2 2

  7. Spring Tide and Neap Tide 180 Spring tide • ______ degree alignment of earth, moon, and sun. • Causes high tides to be very _____ and low tides to be very ___________. Neap Tide • ______ degree alignment of earth, moon and sun. • High tides are not very high and low tides are not very low. high low 90

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