Review for Unit 5 Part 1

Which choice is a nearly circular orbit?

• rotation

• revolution

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Which of the following factors keeps Earth in motion around the sun?

• Speed

• Mass

• Gravity

• Friction

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Why is the force of gravity between the balls in Pair 2 greater than the force of gravity between the balls in Pair 1?

• The balls in Pair 2 are closer together than the balls in Pair 1.

• The balls in Pair 2 have a greater mass than the balls in Pair 1.

• The balls in Pair 1 have more rolling friction than the balls in Pair 2.

• The balls in Pair 1 have more magnetic force than the balls in Pair 2.

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Which image best represents a portion of the heliocentric model of the solar system? (S=Sun, E=Earth, and M=Moon)

• A

• B

• C

• D

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One of the main differences between the outer and inner planets is __________.

• The inner planets all have water
• the inner planets are much bigger than the outer planets
• the outer planets are gas planets
• the outer planets have rings, and the inner planets don't

Where is the asteroid belt found?

• between earth and mars
• Between Uranus and Neptune
• Between Mercury and Venus
• Between Mars and Jupiter

Which of the following is the smallest?

• Our solar system

• Jupiter

• The Andromeda Galaxy

• The Sun

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The objects shown in the following diagrams have different masses and are different distances apart. Which

diagram shows the two objects that have the GREATEST force of gravity acting between them?

• A

• B

• C

• D

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The objects shown in the following diagrams have different masses and are different distances apart. Which

diagram shows the two objects that have the LEAST force of gravity acting between them?

• A

• B

• C

• D

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This image shows the:

• Geocentric Solar System
• Heliocentric Solar System

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