Law of Gravitation
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Questions and Answers

What did Isaac Newton realize about the force acting on the planets and the moon?

  • The same gravitational force is responsible for the motion of all these objects (correct)
  • Each object is affected by a different force
  • The moon is not affected by any force
  • The planets are not affected by any force

    • What causes an object to change its speed or direction of motion?

  • Magnetic force
  • Frictional force
  • Electric force
  • Gravitational force (correct)

    • What made Newton start thinking about the force of gravity?

  • An earthquake
  • The fall of an apple near him (correct)
  • The motion of the moon
  • A flash of lightning

    • What did activity 9.1 involving a stone on a thread demonstrate about motion?

    <p>The stone follows a circular path due to a centripetal force</p> Signup and view all the answers

    What factor does the force between two objects depend on, according to the universal law of gravitation?

    <p>The product of their masses</p> Signup and view all the answers

    How is the constant of proportionality in the universal law of gravitation defined?

    <p>G = Force / (Mass × Distance)</p> Signup and view all the answers

    How did Henry Cavendish determine the value of the universal gravitation constant, G?

    <p>By using a sensitive balance</p> Signup and view all the answers

    What is the SI unit of the universal gravitation constant, G?

    <p>N m^2/kg^2</p> Signup and view all the answers

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

    <p>It is directly proportional to the product of their masses</p> Signup and view all the answers

    Why does a heavy object not fall faster than a light object, even though gravitational force acts on all objects in proportion to their masses?

    <p>Because the acceleration due to gravity is higher for lighter objects</p> Signup and view all the answers

    What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?

    <p>$6.64 \times 10^{−11}$ N</p> Signup and view all the answers

    What happens to the force of gravitation between two objects when the distance between them is reduced to half?

    <p>It becomes four times the original force</p> Signup and view all the answers

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