Gravitational Force and Potential Energy
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Questions and Answers

What does the universal gravitational constant (G) represent in Newton's Law of Gravitation?

  • It is the force experienced by a unit mass from a unit distance.
  • It is the proportionality constant that relates mass and distance.
  • It establishes the relationship between mass and gravitational force. (correct)
  • It determines the amount of force an object experiences in a vacuum.

    • What is the relationship between gravitational force and the distance between two bodies?

  • Gravitational force is inversely proportional to the product of the masses.
  • Gravitational force increases as the distance decreases.
  • Gravitational force decreases with the square of the distance. (correct)
  • Gravitational force is independent of the distance between the bodies.

    • When comparing gravitational forces exerted on two different masses, which statement is true?

  • Gravitational pull can be negligible for heavy objects.
  • Gravitational force increases with smaller masses.
  • All objects experience equal gravitational pull regardless of mass.
  • A mass of 1 kg experiences a gravitational force of 9.8 N on Earth's surface. (correct)

    • Which phenomenon is correctly explained by Newton's Law of Gravitation?

    <p>The motion of planets around the Sun.</p> Signup and view all the answers

    Why does a heavy object exert a stronger gravitational force than a light object?

    <p>Larger mass increases the product of masses in the gravitational formula.</p> Signup and view all the answers

    Which factor does NOT influence the gravitational force between two celestial bodies?

    <p>The shape of the bodies.</p> Signup and view all the answers

    How does gravity affect ocean tides?

    <p>Tides are influenced by gravitational pulls from both the Earth and the Moon.</p> Signup and view all the answers

    If two bodies of equal mass are placed 1 meter apart, what can be concluded about their gravitational pull?

    <p>Their gravitational pull is too weak to cause noticeable motion.</p> Signup and view all the answers

    What is the primary reason the Moon revolves around the Earth?

    <p>The gravitational force exerted by the Earth on the Moon.</p> Signup and view all the answers

    Calculate the gravitational force between two persons, each having a mass of 100kg, standing 1m apart.

    <p>$3.33 \times 10^{-11} N$</p> Signup and view all the answers

    What does gravitational potential energy depend on?

    <p>The mass of the object and the distance from the Earth.</p> Signup and view all the answers

    Which of the following best describes the gravitational force between the Sun and the Earth?

    <p>It keeps the Earth bound to the Sun.</p> Signup and view all the answers

    Where should a small particle be placed so that the net gravitational force on it due to two bodies of masses 4m and 8m is zero?

    <p>On the line extending away from the smaller mass.</p> Signup and view all the answers

    Which of the following statements is true about the force of gravity acting on different masses?

    <p>Gravity acts equally on all objects regardless of mass.</p> Signup and view all the answers

    What phenomenon is primarily caused by the gravitational force of the Moon on Earth?

    <p>Ocean tides.</p> Signup and view all the answers

    What is the value of the universal gravitational constant (G)?

    <p>$6.67 \times 10^{-11} \ m^3 kg^{-1} s^{-2}$</p> Signup and view all the answers

    Study Notes

    Gravitational Force

    • Gravitational force is a fundamental force of attraction between any two objects with mass.
    • The force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
    • This force is what keeps the Moon orbiting Earth and Earth orbiting the Sun.
    • The gravitational force between two objects with masses of 100 kg each, separated by 1 meter, is extremely small.
    • The gravitational force between a 1 kg object and Earth, however, is much larger, resulting in objects falling towards the earth.

    Gravitational Potential Energy

    • Gravitational potential energy is the energy an object possesses due to its position in a gravitational field.
    • This energy is related to the work required to lift an object against gravity.
    • Gravitational potential energy can be calculated as U = -GMm/r, where G is the gravitational constant, M is the mass of the source, m is the mass of the test object, and r is the distance between their centers.

    Escape Speed

    • Escape speed is the minimum velocity an object needs to escape the gravitational pull of a celestial body.
    • If an object is launched at a speed less than escape speed, it will eventually fall back to the celestial body.
    • Objects launched at escape speed or higher will permanently leave the gravitational influence of the celestial body.

    Newton's Law of Universal Gravitation

    • The force of attraction between two objects is directly proportional to the product of their masses.
    • The force of attraction is inversely proportional to the square of the distance between their centers.
    • The mathematical formula for this law is: F = G(m1 * m2)/r^2, where G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.
    • This law can be used to calculate the gravitational force between any two objects in the universe.

    Examples of Gravitational Force

    • The gravitational force between the Sun and Earth keeps Earth in orbit around the Sun.
    • The gravitational force between the Earth and Moon keeps the Moon in orbit around Earth and also causes tides.
    • The gravitational force between a person and Earth is what keeps us grounded and prevents us from floating off into space.

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    PHY101 General Physics I (2 Units) PDF

    Description

    Explore the concepts of gravitational force and gravitational potential energy in this quiz. Learn about how these fundamental principles govern the interactions between mass and the energy associated with position in a gravitational field. Test your understanding of the formulas and applications involved.

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