Gravitational Forces and Orbital Motion

What is the formula for Newton's Law of Universal Gravitation?

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Which of the following best describes the concept of gravitational force?

• It is a force that acts only between charged particles.

• It is a force that acts between any two masses.

• It is a force that acts only at the atomic level.

• It is a force that acts only in the presence of air.

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If the distance between two objects is doubled, how does the gravitational force between them change?

• It becomes four times stronger.

• It becomes twice as strong.

• It becomes half as strong.

• It becomes one-fourth as strong.

A satellite orbits Earth in a circular path. Which of the following forces keeps it in orbit?

• Electrostatic force

• Gravitational force

• Magnetic force

• Nuclear force

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Explain why astronauts appear weightless in a space station orbiting Earth.

• They are too far from Earth's gravitational pull.

• They are in free fall, experiencing continuous free-fall towards Earth.

• The space station has no gravity.

• They are outside Earth's atmosphere.

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What happens to the gravitational force if the mass of one of the objects is tripled?

• The force is reduced to one-third.

• The force remains the same.

• The force is tripled.

• The force is squared.

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Which of the following is a correct unit for gravitational force?

• Joules

• Newtons

• Watts

• Pascals

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Describe the relationship between gravitational force and mass.

• Gravitational force is inversely proportional to mass.

• Gravitational force is directly proportional to the square of the mass.

• Gravitational force is directly proportional to mass.

• Gravitational force is independent of mass.

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