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Do Now In your notebook, answer the following question in complete sentences: What is the difference between mass and weight?

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Mass vs. Weight Mass The amount of matter in an object Weight The force of gravity acting on an object The difference?? GRAVITY

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What forces act upon celestial bodies? Gravity

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Objectives Define the term gravity. Compare and contrast mass and weight Describe the factors that affect gravity

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What is Gravity? Gravity is the attractive force between two objects Gravitys magnitude depends on: Mass of objects involved Distance between objects

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Newtons Law of Gravitation F = Gravitational Force G = Universal Gravitation Constant = 6.6726x10 -11 m 3 /(kgs 2 ) m 1 = mass of first object m 2 = mass of second object r = distance between centers of objects

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Gravity in Space Body Multiple of Earth gravity m/s 2 Sun27.90274.1 Mercury0.37703.703 Venus0.90328.872 Earth19.8226 Moon0.16551.625 Mars0.38953.728 Jupiter2.64025.93 Saturn1.13911.19 Uranus0.9179.01 Neptune1.14811.28 Pluto0.06210.610

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Gravity: A Force of Attraction

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