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Lecture 8

Lecture 8 - Tides - October 3.docx

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

October 3, 2013. Lecture 8 – Tides: Earth-Moon Interactions Tides  Causes: o Gravitational force of water in a balloon causes it to drop when you hold it by the tie o Moon is the largest body closest to Earth  Not thaaaat close, still closest  384400 km to be exact o The exerted gravitational force of the moon is what pulls at the water; “deforms” the bodies of water  Rock also feels the pull but only slightly o Moon pulls water as it rotates around the Earth  But the Earth also rotates  So basically the gravitational pull of the Moon creates an ovular structure of water around the Earth (like holding the balloon by the tie); as we rotate through a full day the moon stays in relatively the same place and when we rotate through the day we pass through two high tides (the ends of the oval) and two low tides (the middle of the oval) every 6 hours o Moon orbits as well  So high and low tides will be at different times of the day depending on the moon’s position in its orbit  Example: The FULL moon
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