# Doubt in Inertial frame of reference

Newton's laws of motions are not applicable in Non-inertial frames of reference which means only mutually accelerated frames of references, My question is how can we apply Newton's laws of motions for practical experiments such as simple pendulum, motion of a ball, etc. conducted in near surface of earth

I referred a book it says that orbital acceleration of the Earth is insignificant and the effect of the Earth’s rotation is normally a small correction, the earth may be assumed to be inertial frame.
I know there is a reason we are assuming earth may be inertial frame, have some idea that it should be something regarding rotation of frame of reference, but i am unable to reason it precisely, Help me

WannabeNewton
Newtons laws can be applied in arbitrarily accelerating/rotating frames as long as you take into account the pseudo forces.

jfizzix