Inertial reference frame for 2&3 law

[astro2cosmos]

Does the concept of Inertial reference frame also applicable for 2nd & 3rd law of motion?

 

[D H]

The 2nd and 3rd laws are only valid in inertial frames. One way to look at the first law is that it establishes the context for the 2nd law. The first law defines the concept of an inertial frame and defines the concept of momentum. The second law is also more definition than law; it defines the concept of force. The third law is a true scientific law.

 

[astro2cosmos]

The 2nd and 3rd laws are only valid in inertial frames. One way to look at the first law is that it establishes the context for the 2nd law. The first law defines the concept of an inertial frame and defines the concept of momentum. The second law is also more definition than law; it defines the concept of force. The third law is a true scientific law.

since 2nd law contain the term of acceleration & inertial frame consider the constant velocity or non-accelerated approach.
so i think 2nd law apply in non-inertial frame instead of inertial frame. am i right?? or wrong??
clear me.
thanks

 

[D H]

That the second law subsumes the first is a common mistake. Look at it this way: Newton was a very smart guy. Not just the smartest of his time, but possibly the smartest person of all time. He felt the first law was essential, that it is something more than just a special case of the second law.

And no, the second law only applies in an inertial frame. Fictitious forces must be introduced to make the second law appear to apply in a non-inertial frame.

 

[PJC01]

Yes, the concept of an inertial reference frame is applicable for both the second and third laws of motion. An inertial reference frame is a frame of reference in which Newton's laws of motion hold true. This means that in an inertial reference frame, an object will remain at rest or continue to move at a constant velocity unless acted upon by an external force (second law), and for every action, there is an equal and opposite reaction (third law). These laws are fundamental principles of motion and are valid in any inertial reference frame, regardless of its position or velocity. Therefore, for the second and third laws of motion to be valid, the reference frame must also be inertial.