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Is centre of mass of reality ?...

Is centre of mass of reality ?

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No, centre of mass is a hypothetical point at which the whole mass of the system is supposed to be concentrated.
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Knowledge Check

  • The centre of mass

    A
    coincides always with the geometrical centre of the body.
    B
    always lies on a given body.
    C
    of two-particle system always lies on the line joining two particles.
    D
    is the average of the position vectors of all the

  • The centre of mass of a body

    A
    depends on the choice of co - ordinate system
    B
    is independent of the choice of co - ordinate system .
    C
    may or may not depend on the choice of co - ordinate system
    D
    None of the above

  • The centre of mass of a body

    A
    Lies always at the geometrical centre
    B
    Lies always inside the body
    C
    Lies always outside the body
    D
    May lie within or outside the body.
    • MODERN PUBLICATION-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-REVISION EXERCISES (Very Short Answer Questions Carrying 1 mark)
    1. Is centre of mass of reality ?

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    2. The centre of mass of two particles system lies

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    3. Can centre of mass of a body lie where there is absolutely no mass ?

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    4. If one of the particles is heavier than mass other, to which side will...

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    5. Which physical quantity corresponds to the moment of the force?

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    6. What is an isolated system ?

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    7. Which component of linear momentum does not contribute to angular mome...

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    8. The moment of linear momentum is called

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    9. Can the couple acting on a rigid body produce translatory motion ?

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    10. What is the position of the centre of mass of a cubical or rectangular...

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    11. Can a body moving in a circular path be at equilibrium?

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    12. Why the bottom of a ship is made heavy?

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    13. Find the centre of mass of a uniform triangula lamina.

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    14. What can we conclude for the potential energy of a system in stable eq...

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    15. What is the physical significance of moment of inertia?

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    16. Does the moment of inertia of a body change with the speed of rotatio...

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    17. Does the moment of inertia of a rigid body change with the axis of rot...

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    18. Does the radius of gyration depend on the speed of the rigid body?

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    19. About which axis would the moment of inertia of a body be minimum ?

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    20. What are the units and dimensions of moment of inertia ? Is it a vecto...

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