Understanding Gravity
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Questions and Answers

What is the primary reason that planets and stars are roughly spherical in shape?

  • The collision and merging of smaller objects
  • The radial gravitational attraction toward the center of mass (correct)
  • The uniform distribution of mass within the object
  • The increase in rotational speed over time

    • How does the rotational speed of a planet or star affect its shape?

  • Increased rotational speed causes the object to become more spherical (correct)
  • Rotational speed has no effect on the shape of the object
  • Increased rotational speed causes the object to become more irregular in shape
  • Increased rotational speed causes the object to become more elliptical

    • What is the relationship between a celestial body's mass distribution and its shape?

  • The shape of a celestial body is independent of its mass distribution
  • The more the mass is distributed toward the edges, the more spherical the shape
  • The more concentrated the mass at the center, the more spherical the shape (correct)
  • The more uniform the mass distribution, the more spherical the shape

    • How does the concept of an ice skater spinning more quickly when their arms are brought closer to their body relate to the shape of planets and stars?

    <p>It explains why planets and stars become more spherical as they spin faster</p> Signup and view all the answers

    What is the role of gravitational attraction in determining the shape of planets and stars?

    <p>Radial gravitational attraction toward the center of mass is the primary reason planets and stars are roughly spherical</p> Signup and view all the answers

    What is the primary factor that determines the strength of gravity between two objects?

    <p>The mass of the objects</p> Signup and view all the answers

    Which of the following statements about gravitational fields is true?

    <p>All objects have a gravitational field around them</p> Signup and view all the answers

    What keeps planets and moons in orbit?

    <p>The gravitational force</p> Signup and view all the answers

    How does the strength of gravity in the solar system compare to gravity on a single planet?

    <p>Solar system gravity follows the same principles as planetary gravity</p> Signup and view all the answers

    What determines an object's weight?

    <p>The object's mass and the strength of gravity</p> Signup and view all the answers

    According to Newton's law of universal gravitation, what is the relationship between the gravitational force and the masses of the two objects involved?

    <p>The gravitational force is directly proportional to the product of the two masses.</p> Signup and view all the answers

    Why do planets orbit the Sun instead of the other way around?

    <p>The Sun has a stronger gravitational field than the planets.</p> Signup and view all the answers

    What is the process by which smaller objects collided and stuck together to form larger objects in the early solar system called?

    <p>Accretion</p> Signup and view all the answers

    According to Newton's law of gravitation, how does the gravitational force between two objects change as the distance between them increases?

    <p>The gravitational force decreases inversely with the square of the distance.</p> Signup and view all the answers

    What is the primary reason why we feel Earth's gravity but not the gravitational fields of other planets?

    <p>We are much closer to Earth than to other planets.</p> Signup and view all the answers

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