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Lecture 9

Astronomy Lecture 9.docx

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Wilfrid Laurier University
Patrick Mc Graw

Astronomy Lecture 9 Why doesn’t the Moon fall down? - What goes up, always comes down - What goes up must come down unless the only force acting on it is the gravity, or unless the net force is acting down. Revisiting action-reaction - A change in velocity is a change in acceleration - Since the moon is in a curved orbit there should be force there - The force of gravity is playing the same role the string is playing - What way would the moon go, if the earth disappeared? It would move up and down - It comes in the law of inertia The Universal theory of gravity - Everything that has mass, is being felt by everything else - Gravity is force that is always attracted to an object - Its dark, because we can see it - The gravitational force between two objects depends on the product of their masses - Earth’s mass is much greater than a building’s mass - The gravitational force between two objects also depends on the inverse-square of their separation - Force is g
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