6.1.2 Gravity and Inertia Review

1. Describe in detail what would happen if the Sun suddenly disappeared from the solar system.

• The planets would orbit faster around a new star.
• Temperatures would rise dramatically, causing a heatwave.
• Life would thrive without the Sun's influence.
• The planets would drift into space, temperatures would plummet, and life would become unsustainable.

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2. Explain how the moon stays in orbit around the Earth and doesn't crash into us.

• The moon is held in place by a giant invisible string.
• The moon is constantly pushed away by the sun's rays.
• The moon orbits due to the Earth's rotation speed.
• The moon stays in orbit around the Earth due to the balance of gravitational force and its orbital velocity.

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3. If Earth's mass decreased to one half its original mass, with no change in radius, then your weight would

• stay the same
• decrease to one half your original weight
• decrease to one quarter your original weight
• none of the above

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4. An object with more mass has more gravity.

• true
• false

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5. What are the two different factors that affect the gravitational force of different objects?

• size and distance
• mass and size
• density and distance
• mass and distance

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6. Gravity causes what on Earth?

• Weight
• Mass
• Volume
• Atmosphere

7. Which of these planets has more gravity?

• Jupiter
• Earth

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8. What OBJECT in the solar system has more gravity than Jupiter and Earth?

• The moon
• The Sun
• Saturn
• Pluto

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9. The two factors that combine to keep Earth and the moon in their orbits are-

• Speed and inertia
• Gravity and inertia
• Gravity and speed
• Axis and inertia

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10. The tendency of a moving object to continue moving in a straight line or a stationary object to remain in place is called-

• Speed
• Gravity
• Inertia
• Mass