Why does Earth have tides?
Readings: Ch. 11, pg. 257-274 This is a text version of the notes presented in class. Feel free to email the instructor (dpalmer@kent.edu) with any comments about the format and ease of use of these online notes. 1. Tides – Tide Generating Forces – Inertia and Gravity -Dynamic Tides – Seiches in Enclosed Basins 2. Wave Energy Revisited Graphic: Garrison, Fig. 10.5, pg 232. 3. Gravity and Tides Gravitational attraction between the Earth and other astronomical bodies gives rise to tides Strength of gravitational attraction depends on: – masses of the two bodies – distance between the two bodies The strongest tides are forced by: – the Earth and moon – the Earth and sun 4. Tide Generating Forces – Gravity Gravity pulls each point on Earth toward the center of the moon Gravitational force (pink arrows): – varies in strength (the arrows are different lengths) – is not oriented the same direction everywhere Graphic: Garrison, Fig. 11.5, pg 260 5. Tide Generating Forces – Inertia Inertia exer
