Gravitational fields

Surrounding a magnet is a magnetic field. Surrounding an electron is an electric field. Surrounding Earth is 

• an alteration in space in which mass experiences a force.
• a gravitational field
• both of these
• neither of these

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Earth's gravitational field extends

• only above and beyond Earth's surface and cancels inside Earth
• both inside and outside Earth and throughout the entire universe
• neither of these

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The direction of a gravitational field is

• in the same direction as gravitational attraction.
• away from the center of gravity of an object.
• opposite to the direction of gravitational attraction.

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An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed

• toward the asteroid.
• away from the asteroid.
• toward the Sun.

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An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be

• zero.
• 40 N.
• 120 N.
• 360 N.

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NGSS.HS-PS2-4

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

• be the same.
• double
• quadruple.
• be eight times as much as now.

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Rate this statement: No force due to Earth's gravity acts on astronauts inside the orbiting space station. 

• always true while in orbit
• sometimes true while in orbit
• always false

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NGSS.HS-PS2-4

If an object is placed exactly halfway between Earth and the Moon, it would fall toward the

• Earth.
• Moon.
• neither of these

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If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will

• come to an abrupt stop at Earth's center.
• speed up until it gets to Earth's center
• speed up until it reaches Earth's other side.
• slow down until it reaches Earth's center.

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Half-way to the center of a planet of uniform density, your weight compared to that at the surface would be

• one-quarter.
• one-half.
• three-quarters.
• the same as at the surface.

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