Understanding Planetary Motion and Gravity

Which of the following best describes Kepler's First Law of Planetary Motion?

• Planets move in circular orbits with the Sun at the center.

• Planets move in elliptical orbits with the Sun at one focus.

• Planets move in parabolic orbits with the Sun at the center.

• Planets move in hyperbolic orbits with the Sun at one focus.

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NGSS.HS-ESS1-4

According to Kepler's Second Law, what happens to a planet's speed as it moves closer to the Sun in its orbit?

• The speed decreases.

• The speed remains constant.

• The speed increases.

• The speed becomes zero.

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NGSS.HS-PS2-4

Kepler's Third Law of Planetary Motion can be expressed mathematically as:

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Newton's Law of Universal Gravitation states that the force between two masses is:

• Directly proportional to the square of the distance between them.

• Inversely proportional to the square of the distance between them.

• Directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

• Inversely proportional to the product of their masses and directly proportional to the square of the distance between them.

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NGSS.HS-PS2-4

Which of the following equations represents Newton's Law of Universal Gravitation?

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How does gravity affect the motion of planets in the solar system?

• It causes planets to move in straight lines.

• It keeps planets in elliptical orbits around the Sun.

• It causes planets to move away from the Sun.

• It has no effect on planetary motion.

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NGSS.HS-PS2-4

What is the primary reason Earth experiences seasons?

• The distance from the Sun changes significantly throughout the year.

• The tilt of Earth's axis relative to its orbit around the Sun.

• The elliptical shape of Earth's orbit.

• The gravitational pull from the Moon.

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Which of the following best describes Earth's movement within the Milky Way Galaxy?

• Earth orbits the center of the Milky Way in a circular path.

• Earth is stationary within the Milky Way.

• Earth orbits the center of the Milky Way in an elliptical path.

• Earth moves randomly within the Milky Way.

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NGSS.HS-ESS1-4

In the context of the Local Group of galaxies, which of the following statements is true?

• The Local Group is a cluster of stars within the Milky Way.

• The Local Group is a collection of galaxies, including the Milky Way.

• The Local Group is a single galaxy larger than the Milky Way.

• The Local Group is a collection of planets orbiting the Milky Way.

What is the significance of the gravitational force in the context of the Local Group of galaxies?

• It causes galaxies to collide and merge.

• It keeps the galaxies bound together in the group.

• It has no effect on the galaxies in the group.

• It causes galaxies to move away from each other.

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