Chapter 20 Test Review

What is the center of gravity in our solar system?

• Earth
• Moon
• Sun

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Which characteristic of the Sun primarily determines the orbits of planets in our solar system?

• large volume
• mostly made of hydrogen
• strong gravitational field
• high surface temperatures

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The further away objects are

• the stronger the gravitational pull.
• the weaker the gravitational pull.
• the gravitational pull does not change.

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The more mass either object has

• the stronger the gravitational pull.
• the weaker the gravitational pull.
• the gravitational pull does not change.

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Which objects would have the least gravity between them? (Assume all objects have the same mass.)

• A
• B
• C

The Sun releases huge amounts of energy due to

• nuclear fusion
• nuclear fission

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Earth's rotation give us

• the seasons.
• day and night.
• a year.

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The following picture best represents the Earth

• rotating
• revolving

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How many days does the Earth take to revolve around the sun?

• 360 days
• 235 days
• 365 days
• 395 days

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Which relationship would a scientist most likely model using calculations based on the law of universal gravitation?

• the internal structure and position of the Moon
• factors that affect Earth’s atmosphere and climate
• natural events that change the shape of Earth’s surface
• the motion of planets within the solar system

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