Gravitation Concepts and Applications
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Questions and Answers

What does the universal law of gravitation state about the force of attraction between two objects?

  • It is inversely proportional to the product of their masses.
  • It is directly proportional to the product of their masses. (correct)
  • It varies with the square of the distance between them.
  • It is directly proportional to the distance between the objects.

    • What is the value of the universal gravitational constant, G?

  • 6.673 x 10^11 Nm^2/kg^2
  • 9.8 x 10^-11 Nm^2/kg^2
  • 9.8 Nm^2/kg^2
  • 6.673 x 10^-11 Nm^2/kg^2 (correct)

    • How does the acceleration due to gravity, g, change with distance from the Earth's surface?

  • It remains constant regardless of distance.
  • It fluctuates based on temperature.
  • It decreases as you move away from the surface. (correct)
  • It increases as you move away from the surface.

    • What does Archimedes' principle state about buoyant force?

    <p>It is equal to the weight of the fluid displaced by the object.</p> Signup and view all the answers

    Which of the following defines relative density?

    <p>Ratio of the density of a substance to the density of water at 4°C.</p> Signup and view all the answers

    Signup and view all the answers

    Study Notes

    Gravitation

    • Gravitation is the force of attraction between any two objects in the universe.
    • The force of attraction is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between their centers.
    • The universal gravitational constant (G) is 6.673 x 10-11 Nm2/kg2.
    • This constant does not change based on medium, temperature, or other variable factors.

    Applications of Gravitation

    • The universal law of gravitation explains phenomena like:
      • Earth's gravitational pull
      • The moon orbiting Earth
      • Planets orbiting the sun

    Acceleration Due to Gravity (g)

    • g represents the acceleration due to Earth's gravity, and its value is approximately 9.8 m/s2.
    • The value of g decreases with distance from the Earth's surface or as you descend into a mine.

    Weight

    • Weight is the force with which Earth attracts an object.
    • Weight is calculated as mass multiplied by acceleration due to gravity (w = mg).
    • An object's weight on the moon is about one-sixth of its weight on Earth.

    Thrust and Pressure

    • Thrust is a force applied perpendicularly to a surface.
    • Pressure is thrust per unit area (P = F/A).
    • The SI unit of pressure is the pascal (Pa).

    Buoyancy

    • Buoyancy is the upward force exerted by a fluid on an object immersed in it.
    • Archimedes' principle states that the buoyant force is equal to the weight of the fluid displaced by the object.

    Relative Density

    • Relative density is the ratio of the density of a substance to the density of water at 4°C.

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    Gravitation PDF

    Description

    Explore the fundamental concepts of gravitation, including the universal law of gravitation, the gravitational constant, and applications such as the Earth’s pull and planetary orbits. Test your understanding of the acceleration due to gravity and how weight is calculated. This quiz is perfect for anyone studying physics or interested in the forces that govern our universe.

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