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CBSE Class 11 Physics NCERT Solutions: Chapter 8, Gravitation

Sep 21, 2018 09:50 IST
    Gravitation: NCERT Solutions
    Gravitation: NCERT Solutions

    Gravitation is a force by the virtue of which objects get attracted towards each other because they have mass. There are various laws and principles which govern this attractive force in the whole universe. Class 11 Physics NCERT chapter- Gravitation explains some of such important laws and concepts.

    In the NCERT book, all the concepts and fundamentals are explained in easy and simple language so that students may easily understand them. Moreover, the questions given in NCERT book are a very effective source to learn the application of different laws and concepts in the world around.

    In this article, we are providing the solutions to all the NCERT questions of Class 11 Physics chapter- Gravitation. Subject experts at jagranjosh.com have explained these NCERT solutions to help students find the right approach to break the various problems given in the NCERT book.

    Go through the class 1, Gravitation NCERT solutions and learn the right technique to write perfect answers in the exams so as to get optimum marks.

    Students may download all the NCERT Solutions in the form of PDF.

    Main topics discussed in Class 11 Physics chapter- Gravitation are:

    • Kepler’s laws
    • Universal law of gravitation
    • The gravitational constant
    • Acceleration due to gravity of the earth
    • Acceleration due to gravity below and above the surface of earth
    • Gravitational potential energy
    • Escape speed
    • Earth satellites
    • Energy of an orbiting satellite
    • Geostationary and polar satellites
    • Weightlessness. 

    CBSE Class 11 Physics Syllabus 2018 - 2019

    Some of the questions and their solutions from NCERT Solutions for Class 11: Gravitation, are as follows:

    Q. Choose the correct alternative and give explanation:

    (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy.

    (b) The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s influence.

    Sol.

    (a) Kinetic Energy

    Explanation:

    Total mechanical energy of a satellite is the sum of its Kinetic energy (always Positive) and potential energy (may be negative). At Infinity, the gravitational potential energy of the satellite is zero. As the Earth-satellite system is a bound system, the total energy of the satellite is negative.

    Hence, the total energy of an orbiting satellite at infinity is equal to the negative of its kinetic energy.

    (b) Less

    Explanation:

    An orbiting satellite gains a certain amount of energy that enables it to revolve around the Earth. This energy is provided by its orbit. It requires comparatively less energy to move out of the impact of the Earth's gravitational field than a stationary object on the Earth`s surface that initially possesses no energy.

    Download all the NCERT solutions for Class 11: Gravitation, from the following link:

    Class 11 Physics NCERT Solutions: Gravitation

    To get more of such important articles for CBSE Class 11, click here.

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