Unit 8 Review Science 6th grade Solar System

THe planets in the solar system orbit a certain object. The pull that the object they orbit exerts on them is called

• electromagnetic force

• friction

• gravity

• air resistance

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The existence of the force of gravity explains why the moon

• orbits earth

• is not in orbit

• orbits objects that do not have mass

• is in an irregular orbit

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What force keeps the planets in their continuous orbits around the Sun?

• Rotation

• Gravity

• Revolution

• Magnetism

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What force governs the motion and patterns of objects in our solar system?

• the sun moves in an elliptical pattern and all celestial objects follow its patterin

• gravity keeps everything orbiting in an elliptical pattern around earth

• gravity keeps celestial objects orbiting in an elliptical pattern around the sun

• equal and opposite forces keep everything orbiting in an elliptical patterin

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Which statement best explains the cause of the moon's motion?

• the moon is acted upon by balanced forces so the orbit is circular

• gravitational forces from the sun and the earth are equal on the moon causing it to orbit

• the moon is constantley affected by the unbalanced force ot the earth's gravity which causes it to orbit earth

• a gravitational force millions of years ago pulled the moon in an elliptical direction causing its motion

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The sun is the center of our solar system. If we lost the sun what would happen to the planets?

• the planets would continue on the same path

• the planets would travel in a different path

• the planets would stop moving

• the planets would explode

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The existence of the force of gravity explains why the moon

• appears to change in size each month

• has no atmosphere

• orbits around the earth

• appears brighter on different nights

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Sir Isaac Newton realized that the same force that acts on falling objects also keeps the planets in their orbits. He called this force

• magnetism

• gravity

• friction

• electricity

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Uranus is

• an inner planet tha has no moons

• a gas giant that rotates on its side

• an outer planet that has only 1 moon

• a mass of hydrogen and helium that has visible rings

Which planet is closest to the Sun and has extreme fluctuations in temperature due to its thin atmosphere?

• Venus

• Saturn

• Uranus

• Mercury