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The Earth moving round the sun in a circ...

The Earth moving round the sun in a circular orbit is acted upon by a force and hence work must be done on the Earth by the force. Do you agree with this statement ?

Text Solution

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The statement is wrong as the centripetal force acting on the Earth is at right angles to the direction of its displacement i.e., centripetal force is along the radius of the circular orbit and the displacement is along its tangent. (Radius and tangent are perpendicular to each other).
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Knowledge Check

  • The earth revolves round the sun in an elliptical orbit. Its speed

    A
    goes on decreasing continuously
    B
    greatest when it is closest to the sun
    C
    greatest when it is farthest from the sun
    D
    constant at all the points on the orbit

  • A satellite is revolving round the earth in circular orbit

    A
    if mass of earth is made four times, keeping other factors constant, orbital speed of satellite will become two times
    B
    corresponding to change in part(a), times period of satellite will become half
    C
    when value of `G` is made two times orbital speed increases and time period decreases
    D
    `G` has no effect on orbital speed and time period

  • When a body moves in a circular path, no work is done by the force since,

    A
    There is no displacement
    B
    There is no net force
    C
    Force and displacement are perpendicular to each other
    D
    The force is always away from the centre

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    Assertion : A force act upon the earth revolving in a circular orbit about the sun. Hence work should be done on the earth. Reason : The necessary centripetal force for circular motion of earth comes from the gravitational force between earth and sun.

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