JAMB Physics questions: Gravitational field

13 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Gravitational field· JAMB

   The gravitational force between two masses is F. If the distance between them is doubled, the force becomes

   • A2F
   • BF/2
   • CF/4
   • D4F

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   Explanation and discussion

2. Question 2· Gravitational field· JAMB

   Find the weight of a 60 kg man on a planet where the acceleration due to gravity is 4 m/s².

   • A600 N
   • B240 N
   • C15 N
   • D64 N

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   Explanation and discussion

3. Question 3· Gravitational field· JAMB

   A body weighs 50 N on Earth where g = 10 m/s². Its mass is:

   • A0.2 kg
   • B50 kg
   • C500 kg
   • D5 kg

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4. Question 4· Gravitational field· JAMB

   A geostationary satellite orbits the Earth with a period of

   • A1 hour
   • B12 hours
   • C24 hours
   • D365 days

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   Explanation and discussion

5. Question 5· Gravitational field· JAMB

   The escape velocity from a planet depends on the

   • Amass and radius of the planet
   • Bmass of the escaping body
   • Cshape of the escaping body
   • Dcolour of the planet

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6. Question 6· Gravitational field· JAMB

   Find the weight of a 60 kg astronaut on the Moon, where g = 1.6 m/s².

   • A60 N
   • B600 N
   • C37.5 N
   • D96 N

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   Explanation and discussion

7. Question 7· Gravitational field· JAMB

   The centripetal force that keeps a satellite in a circular orbit round the Earth is provided by

   • Aair resistance
   • Bthe satellite's engines
   • Cthe gravitational attraction of the Earth
   • Dthe Sun's light

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8. Question 8· Gravitational field· JAMB

   If the masses of two bodies are both doubled while the distance between them stays the same, the gravitational force between them becomes

   • Atwice as large
   • Bfour times as large
   • Chalf as large
   • Dunchanged

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9. Question 9· Gravitational field· JAMB

   A body has a mass of 6 kg on Earth. What is its mass on the Moon, where g is one-sixth of its value on Earth?

   • A1 kg
   • B6 kg
   • C36 kg
   • D60 kg

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10. Question 10· Gravitational field· JAMB

    If the distance between two masses is doubled, the gravitational force between them becomes

    • Aone-quarter of its value
    • Bhalf of its value
    • Ctwice its value
    • Dfour times its value

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11. Question 11· Gravitational field· JAMB

    At a height above the Earth's surface equal to the Earth's radius, the acceleration due to gravity becomes

    • Ag/2
    • Bg/4
    • C2g
    • Dzero

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    Explanation and discussion

12. Question 12· Gravitational field· JAMB

    The escape velocity from the earth's surface is about

    • A11.2 km/s
    • B1.12 km/s
    • C112 km/s
    • D3 × 10⁸ m/s

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13. Question 13· Gravitational field· JAMB

    A geostationary satellite has an orbital period of

    • A365 days
    • B1 hour
    • C12 hours
    • D24 hours

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    Explanation and discussion