Physics Chapter 9: Gravitation
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Questions and Answers

What did Isaac Newton identify as the force responsible for the motion of planets and the moon?

  • Gravitational force (correct)
  • Electromagnetic force
  • Frictional force
  • Tension force

    • What is needed to change the speed or direction of an object's motion?

  • Momentum
  • Force (correct)
  • Velocity
  • Energy

    • What causes an object to fall towards the earth when dropped from a height?

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

    • What determines the weight of a body at different places?

    <p>Gravitational force at that place</p> Signup and view all the answers

    What does the moon go around?

    <p>The earth</p> Signup and view all the answers

    What type of force is responsible for the motion of objects around the Sun?

    <p>Gravitational force</p> Signup and view all the answers

    According to the universal law of gravitation, the force between two objects is proportional to:

    <p>The square of the distance between them</p> Signup and view all the answers

    What is the force that keeps the moon moving along its circular path around the earth?

    <p>Centripetal force</p> Signup and view all the answers

    Why do we not see the earth moving towards an apple, even though the apple attracts the earth?

    <p>Due to the negligible mass of the apple compared to that of the earth</p> Signup and view all the answers

    What happens to a stone in circular motion when there is no centripetal force acting on it?

    <p>It flies off along a straight line tangent to the circular path</p> Signup and view all the answers

    What causes a change in direction for a stone in circular motion?

    <p>Centripetal force</p> Signup and view all the answers

    According to Newton's third law of motion, how does an apple attract the earth?

    <p>With an equal and opposite force</p> Signup and view all the answers

    What type of force causes a stone to move along a circular path?

    <p>Centripetal force</p> Signup and view all the answers

    Why does the moon not fall towards the earth, despite being attracted by it?

    <p>Because it has negligible mass compared to that of the earth</p> Signup and view all the answers

    What provides the centripetal force needed for the moon to orbit around the earth?

    <p>Gravitational attraction between the moon and earth</p> Signup and view all the answers

    In which direction is the centripetal force acting on an object moving along a circular path?

    <p>Towards the center of the circular path</p> Signup and view all the answers

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