Chapter 7 Planetary Motion Choice

According to Kepler's laws, the paths of the planets are

• parabolas

• ellipses

• earth centered

• circle

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If the mass of a planet near the Sun were doubled, the force of attraction would

• remain constant

• be squared

• be one half as strong

• be doubled

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In Newton's equation for the law of universal gravitation, F = Gm₁m₂/r², r is

• the distance between the centers of the masses

• a universal constant

• the distance between a planet and the Sun

• the difference in the two masses

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According to Kepler's laws, an imaginary line from the Sun to a planet

• remains a constant length through the entire orbit of that planet

• sweeps out larger areas the greater the planet's distance from the Sun than it would in the same time interval when closest to the Sun

• sweeps out larger areas when the planet is closest to the Sun than it would in the same time interval when farthest from the Sun

• sweeps out equal areas in equal time periods

1.    Kepler’s first law states that the Sun is located at one ____ of a planet’s orbit.

• outside

• focus

• Center

• ellipse

Newton found that the gravitational force between two masses is inversely proportional to the square of ____.

• the distance between them

• the sum of the masses

• the product of the masses

• the strength of the gravitational field

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An increase in the strength of the gravitational field surrounding an object result from an increase in that object’s ____.

• orbit

• mass

• density

• radius

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Planets move faster when they are closer to the Sun and slower when they are farther away

• true

• false

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Kepler’s first law states that the planets move in circular orbits, with the Sun at the center

• true

• false

Kepler’s third law states that the square of the ratio of the periods of any two planets is equal to the cube of the ratio of their distances from each other

• true

• false

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