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Explain why gravitational force is calle...

Explain why gravitational force is called a centre force ?

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(a) The centre force is always directed towards or away from a fixed point on the line joining the centres of the spherical bodies .
(b) The motion of body is confined to a plane.
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Knowledge Check

  • If the gravitational force is assumed to vary as the nth power of the distance, then the time period of a planet round the sun will be proportional to :

    A
    `R^(n)`
    B
    `R^(-n)`
    C
    `R^((n+1)/(2))`
    D
    `(R )^((n-1)/(2))`

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