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Grade: 12
Is newton law valid in inertial frame only?? ¿????????????¿??????????????????????????
one year ago

Answers : (3)

Shivangi Khatter
askIITians Faculty
468 Points
one year ago
23526 Points
Dear Tushar
In Newtonian physics, inertial frames are frames that are in uniform motion w.r.t a selected absolute frame of "fixed stars" (we're talking Newton here, so we can have absolute frames). Non inertial frames are frames with acceleration involved (like the rotating frame we have on earth).

In accelerating frames, Newton's first law can be seen as obviously invalid. An object at rest in an inertial frame can be seen to accelerate in a non-inertial frame, even though there's no force acting on them!

 To make the laws come out right, you have to add "pseudo-forces" to the system (which don't really exist), to account for the non-inertiality. One example of a pseudo-force is the Coriolis force on Earth, which accounts for the fact that we're on a spherical rotating frame of reference.

   - The 1st law does not hold in non-inertial frames
   - The 2nd law can be made to hold by adding "pseudo-forces" into the picture
   - The 3rd law does not apply to pseudo-forces
Arun (askIITians forum expert)
one year ago
13 Points
See in Newton laws of motion 
Motion of a body is explained through three laws 
More or less specifically , these laws talk about the relative motion about the body which can only be explained by considering the state of motion. 
Hence it is not valid for non inertial frame of reference
10 months ago
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