NATS 1740 Lecture Notes - Lecture 13: Tidal Locking, Hyperbola, The Moons

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Michael De Robertis, Alireza Rafiee

Document Summary

Earth rotates on its axis once a day => 2 high + 2 low tides daily on earth (most places) The tides on earth largely result of the moon (70% of moon"s gravity) The moon"s gravity pulls harder when it"s near the earth (the near side) The size of tides depend on the phases of the moon. High tides are 25 mins later each day because the moon is 25 mins later rising each day. Moon"s tide is 2 times stronger than the sun"s tide. Synchronous rotation: the moon keeps the same face towards earth all time because earth"s tides lock the moon (keep it facing the same side) => ex: you keep looking at the computer screen while moving around it. With conservation of angular momentum, the moon is pushed away from earth further every year (4cm) => slows earth"s rotation, days get longer.