Gravity and Force Fields

What is the rate at which Earth's gravity accelerates objects in free fall?

• 9.8 m/s²

• 3.14159 km/hr/s

• 13.7 m/s²

• 42 km/h/s

The main reason a baseball comes down when a boy tosses it up into the air is —

• magnetism is pulling the ball down

• the boy cannot see to catch it

• gravity is pulling down on the ball

• gravity pushes the ball in the air

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The force of attraction between all things that have mass

• Gravity

• Weight

• Friction

• Air Resistance

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Newton's SECOND law states:

• an object in motion will remain in motion unless acted on by a net force

• acceleration = net force ÷ mass

• for every action, there is an equal but opposite reaction (forces act in pairs)

The measure of gravitational force

• Gravity

• Weight

• Friction

• Air Resistance

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If a 7 pound object is put in a container of water and NOW only weighs 4 pounds, what is the buoyant force applied from the water?

• 7 pounds

• 4 pounds

• 3 pounds

• none of the above

Which choice best describes a gravitational field?

• A force that pulls people to the Earth.

• A bend in the space-time continuum that attracts masses together over a distance.

• A force that attracts oppositely charged particles.

• A bend in the space-time continuum that can attract and repel objects.

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What is the force that keeps planets in orbit around the sun?

• Electromagnetic force

• Nuclear force

• Gravitational force

• Frictional force

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Which of the following best describes a force field?

• A region in space where a force is experienced

• A field of grass

• A magnetic field

• A field of vision

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If an object is placed in a gravitational field, what happens to it?

• It experiences a force

• It changes color

• It becomes weightless

• It stops moving

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