Gravitational Force and Fields - 12 Physics: Caloundra SHS '24

Newton's law of universal gravitation is ..........

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

• It becomes four times stronger.

• It becomes half as strong.

• It becomes one-fourth as strong.

• It remains the same.

What is the gravitational force between two 1 kg masses separated by a distance of 1 meter?

If a planet has radius and mass, both half of those of the Earth, then the value of g on that planet will be:

• 13.8 m/s²

• 4.9 m/s²

• 9.8 m/s²

• 19.6 m/s²

Jamie is floating in a swimming pool. Alone but not lonely.

How does the gravitational force acting on Jamie compare to when he is on land?

• less, but not zero

• greater

• the same

• zero

The weight of an object in free fall near the Earth’s surface is:

• • 
    the same as when the object is at rest

• zero

• • 
    less than when the object is at rest

• greater than when the object is at rest

Calculate the mass of a planet that has a radius is 6400 km and gravitational field strength is 9.8 N/kg.

• 6 x 10²⁴ kg

• 4 x 10¹⁰ kg

• 9 x 10²⁴ kg

• 5 x 10²³ kg

Which of the following best defines the term "gravitational fields"?

• The region around a magnet where magnetic forces can be detected.

• The area around an electric charge where electric forces are exerted.

• The space around a moving particle where kinetic energy can be measured.

• The region of space surrounding a mass where another mass experiences a force of gravitational attraction.

Which of the following statements is true about gravitational fields?

• Gravitational fields can be shielded by materials like lead.

• Gravitational fields are only present near large masses like planets.

• Gravitational fields extend infinitely but weaken with distance.

• Gravitational fields are stronger at the equator than at the poles.

Which is greater?

• Earth's pull on the Sun

• Sun's pull on Earth