Ch. 8 Physics

Kepler's First Law states

• objects attract other objects with a force that is directly proportional to the product of their masses

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

• an imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

• planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

Kepler's Second Law states

• objects attract other objects with a force that is directly proportional to the product of their masses

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

• An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

• Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

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Kepler's Third Law states

• objects attract other objects with a force that is directly proportional to the product of their masses

• the square of the ratio of the periods of any two planets revolving around the Sun is equal to the cube of the ratio of their average distance from the Sun

• An imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.

• Planets move about the Sun in an elliptical orbit with the Sun at one of the foci.

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This is a statement of which scientific law?

Object attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Law of Universal Gravitation

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As an object moves further from the surface of the Earth, what happens to its mass?

• The mass of the object will not vary as it moves further from the surface of the Earth

• The mass of the object will decrease as it moves further from the surface of the Earth.

• The mass of the object will increase as it moves further from the surface of the Earth.

Force of gravity is directly proportional to

• Mass
• Weight
• Distance
• Time

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Force of gravity is inversely proportional to

• Mass
• Weight
• Distance
• Time

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Two asteroids exert a gravitational force, F, on each other. Some time later, the asteroids are now three times as far from each other as before. Which of the following represents the gravitational force at this distance? 

• F/3
• F/2
• F/6
• F/9

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Which of the following is Newton's Law on Gravitation?

• F=Gm₁m₂/r
• F = Gm₁m₂/r²
• F = Gm₁m₂/2r
• F = m₁m₂/2r

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What states that "every object in the universe attracts every other object"?

• Law of Universal Gravitation
• Newton's First Law of Motion
• My mother
• Inertia & gravity

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