lecture_tan10 - Key Concepts: Lecture 10 Tides Tides as a...

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Key Concepts: Lecture 10 Tides as a consequence of Newton’s Laws Structure of the Earth Intro. to Elements and Atomic Structure, Radioactivity Evolution of Earth’s Surface Weight • Recall Newton’s Law of Universal Gravitation: • Weight is the force of gravity pulling you to the ground: F = constant x m you m Earth r 2 Mass1 x Mass2 Separation 2 Force ! Tides Tides - cyclic change in water depth 2 high tides per day Primarily due to gravitational pull of the Moon. Sun’s effect is about half as strong. Inverse square law of gravity implies: Moon pulls hardest on the water nearest the Moon Moon pulls less hard at the center of the Earth Moon pulls least on the water on the far side 1 2 3 4 5 6 7 8 9 10 Distance 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Force Strong “Spring” tides when Sun and Moon line up. (nothing to do with Spring season) Weak “Neap” tides when Sun and Moon are at 90 degrees from each other as viewed from Earth: tidal forces partially cancel each other out. The local ocean floor also has a large effect on the size of tides leading to variations in the height of tides from place to place.
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Moon is Tidally-Locked to Earth Moon rotates about once per month so that it always presents the same face to Earth. Initially it rotated faster, but was slowed down by tidal
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lecture_tan10 - Key Concepts: Lecture 10 Tides Tides as a...

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