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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 May 2007 22:03:35 IST
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The rotation of earth around its own axis makes it a non inertial frame, for if we are to observe the equilibrium of any particle in the reference frame of earth, we mus introduce pseudo force. The effect of earth rotation is the reason for the coriolis forces that are observed on any particle moving on earth's surface, when observed in the reference frame of earth. Look up the last solved problem in HC Verma's Circular motion. You will get a fairly good idea of coriolis forces from there.
A similar effect is caused by the rotation of earth around the sun.
Now as to why we treat the earth as inertial frame for most problems. First these effects can be neglected for most problems that we solve at +2 level. Second, the complexity of the problem increases twofold.
So for a simpler analysis, we neglect such effects & assume that Newton's Laws are applicable.
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