- #1
AcidRainLiTE
- 90
- 2
My textbook basically defines an inertial reference frame as follows: If you have an object O that has no forces acting on it, and there is a reference frame R where the acceleration of O with respect to R is zero, then R is a inertial reference frame.
This to me seems circular. How does one know if there are no forces acting on O? Don't you need to know if O has any acceleration? How do you know that O has no acceleration? Don't you need an inertial reference frame?
Stated differently:
The definition stated above seems, to my understanding, to say that an inertial reference frame needs to be a reference frame that does not accelerate. And basically I am asking how do you know if it is accelerating? Can you really know without already having an inertial reference frame?
Thanks.
This to me seems circular. How does one know if there are no forces acting on O? Don't you need to know if O has any acceleration? How do you know that O has no acceleration? Don't you need an inertial reference frame?
Stated differently:
The definition stated above seems, to my understanding, to say that an inertial reference frame needs to be a reference frame that does not accelerate. And basically I am asking how do you know if it is accelerating? Can you really know without already having an inertial reference frame?
Thanks.