Mechanics

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30 Nov 2006 20:14:53 IST
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reference frame
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is earth an inertial reference frame?



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polymath's Avatar

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Joined: 9 Nov 2006
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30 Nov 2006 20:24:23 IST
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Precisely no . But it can be approximated to be one.
edison's Avatar

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Joined: 19 Oct 2006
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1 Dec 2006 19:57:31 IST
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Any rotating frame is Non-Inertial frame of reference, so Earth is ofcourse a non-inertial frame as it is rotating
 
Radius of earth = 6400km
Rotation of earth about its axis completes in 24hrs.
so angular displacement of earth in 24 hrs = 2 = 360 degrees
Angular speed is therefore =  = 360/(24*60) deg/min
                                               = 0.25 deg/min
 
Which is very small and thus we have strong reason to assume earth to be an inertial frame of reference.
 
This rotation of earth is however responsible for coriolis force that is maximum at equator and zero at poles.



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