6.11b

Gravity can be defined as the -

• force of attraction between two or more masses.

• friction created when two objects are in contact.

• energy given off by stars due to nuclear reactions.

• path an object follows as it moves through space.

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NGSS.MS-PS2-4

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The path that planets take as they orbit the center of the solar system is a result of the interaction of what two things?

• The forward motion of the planet and gravitational pull of the Sun.

• The mass of the planet and the composition of its atmosphere.

• The magnetic field generated by the planet and friction with the air.

• The age of the solar system and the radioactive decay of elements.

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NGSS.MS-ESS1-1

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NGSS.MS-PS2-4

Why do planets orbit the Sun?

• The Sun is the only celestial object that has a gravitational pull.

• The Sun's chemical composition makes it attract planets.

• Only celestial bodies that emit light, like the Sun, can be at the center of an orbit.

• The Sun is the most massive object in our solar system, so it exerts the greatest gravitational pull.

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Look at the table provided. In which example is the gravitational force of attraction between the two objects the greatest?

• Example 1

• Example 2

• Example 3

• Example 4

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NGSS.MS-PS2-2

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List the steps of the scientific method

d

e

f

c

b

a

Analyze results

Ask a question

Communicate results

Form a hypothesis

Conduct experiment

Draw conclusions

The orbital paths of objects in our solar system are the result of which of the following?

• The shape of the bodies and their chemical compositions.

• The balance between the motion of the bodies and gravitational forces.

• The relative age of the bodies and their chemical compositions.

• The frictional forces acting on the bodies when they hit space debris.

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

REVIEW Q: How many points of Earth, as indicated by the arrows, will be experiencing high tides?

• 1

• 2

• 3

• 4

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NGSS.MS-ESS1-1

Which of the following governs the motion of our solar system?

• Magnetism

• Gravity

• Sunlight

• Friction

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NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Planets in our solar system orbit the Sun because it -

• has the greatest magnetic field.

• is the celestial body with the greatest mass.

• is the brightest object in our solar system.

• formed millions of years before the planets.

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NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

Which two factors affect the strength of the gravitational pull on two objects?

• Mass and density

• Weight and density

• Weight and distance

• Mass and distance

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NGSS.MS-PS2-4