AS101 Lecture Notes - Lecture 9: Net Force, Scientific Method, Weightlessness

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What goes up must come down unless the only force acting on it is the gravity, or unless the net force is acting down. 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. A change in velocity is a change in acceleration. Everything that has mass, is being felt by everything else. Gravity is force that is always attracted to an object. 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 going to decrease, the further your object gets away from you. The orbiting bodies are failing toward the center of the earth. Body in orbit is always falling but is always missing due to horizontal velocity.

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