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When can an object be considered as a po...

When can an object be considered as a point object ? Explain in brief.

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An object can be considered a point object if during motion in a given time it covers a distance much greater than its own size. For example, if a car of size ` 3` metres is moving a few hundred kilometre distance, then to study this motion, the car can be taken as a point object, since `3` m si very much less than few hundred kilometre distance.
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Knowledge Check

  • We can see object due to

    A
    reflection of light from it
    B
    refraction of light through it
    C
    diffraction
    D
    interference of light

  • When an object is heated

    A
    its temperature may rise
    B
    It may expand
    C
    Its state may change
    D
    All of the above

  • When an object is at rest -

    A
    Force is required to keep it in rest state
    B
    No force is acting on it
    C
    A large number of forces may be acting on it which balance each other
    D
    A large number of forces may be acting on it which not balance each other

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