2-2-2 Universal Gravitation

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Presentation transcript:

2-2-2 Universal Gravitation Newton’s 4th Law 2-2-2 Universal Gravitation

What is Gravity? Attractive force between two objects with mass Strength of attraction depends on: Mass of each object (in kilograms) Distance between the objects (in meters) Gravitational Constant (G = 6.67 x 10-11 N∙m2/kg2)

Example #1 3000 m 6 x 105 kg 4 x 105 kg Fg = 1.78 x 10-6 N

Gravitational Proportions The force of gravity is DIRECTLY proportional to mass. What is the effect on a gravitational system if: one mass is doubled Base Case

Gravitational Proportions The force of gravity is DIRECTLY proportional to mass. What is the effect on a gravitational system if: both masses are doubled

Gravitational Proportions The force of gravity is DIRECTLY proportional to mass. What is the effect on a gravitational system if: one mass is reduced by 1/3

Gravitational Proportions The force of gravity is INVERSELY proportional to the square of distance. What is the effect on a gravitational system if: the distance between masses is doubled

Gravitational Proportions The force of gravity is INVERSELY proportional to the square of distance. What is the effect on a gravitational system if: the distance between masses is tripled

Gravitational Proportions The force of gravity is INVERSELY proportional to the square of distance. What is the effect on a gravitational system if: the distance between masses is halved

Gravitational Fields Objects with MASS produce gravitational fields Field lines point inward from ALL DIRECTIONS

End of 2.2.2 - PRACTICE