Earth is a noninertial frame of reference bt it can be made an inertial frame of reference if we neglect the oceans & the winds.why??

Dear Tanvi,

It's true that earth is a non-inertial frame of reference due to its constant motion across the sun as well as the environmental unstabilities.

But almost all the practical problems we face in physics occur at earth only. To study such cases taking into consideration the non-inertial frame of reference would make it unessentially complicated. Moreover, the effect of winds & oceans and earth's rotation/revolution is negligible on the output of the problem.

So, it's just a simplification to make things easier at school level.

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