5.20- Network Review (gravity, tides, orbits)

The definition of gravitational field strength is:

• The region of space surrounding a body where other bodies will feel an attractive force due to it.
• The region of space surrounding a body where other bodies will feel an repulsive force due to it.
• The region of space surrounding a charge where other charges will feel an attractive force due to it.
• The region of space surrounding a charge where other charges will feel an repulsive force due to it.

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NGSS.MS-PS2-4

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The closer together the gravitational field lines.....

• the weaker the gravitational field strength
• the stronger the gravitational field strength
• the more repulsive the gravitational field strength

The speeds of the planets about the sun depend on

• their distances from the sun

• the masses of the planets

• their periods of rotation

• none of these

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NGSS.MS-ESS1-2

At which lettered position does the planet have the greatest speed?

• A

• B

• C

• D

• E

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NGSS.MS-PS2-4

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Based on the picture. Which of the following pairs has the greatest gravitational force? Assume that Deimos and Phobos have approximately the same mass as each other.

• Mars and Phobos

• Mars and Deimos

• Deimos and Phobos

• Mars and Rainey

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NGSS.MS-PS2-4

NGSS.MS-ESS1-2

Use the diagram below to determine the charges of the other 3 balloons. The second balloon has a positive charge. Choose the answer that is correct about all three charges.

• X = positive, Y = negative, Z = negative

• X = positive, Y = positive, Z = negative

• X = negative, Y = negative, Z = positive

• X = negative, Y = positive, Z = positive

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NGSS.MS-PS2-5

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What happens when two items with negative charges come close to each other?

• They repel each other.

• They cause an electrostatic spark.

• They join together, like a perfectly inelastic collision.

• They attract each other.

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NGSS.MS-PS2-5

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Which of the following is true about the gravitational force the sun exerts (pulls) on the Earth and the gravitational force the Earth exerts on the sun?

• The force of Earth’s gravity on the sun is the same as the force of the sun’s gravity on Earth.

• The Earth and the sun do not exert any gravitational force on one another.

• The Earth exerts more gravity on the sun.

• The sun exerts more gravity on Earth.

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

Gravity attracts all objects towards one another.

• False
• True
• It depends

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NGSS.MS-PS2-4

Any object with mass has gravity.

• True
• Sometimes
• False
• Never

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