Is newtons law 1 true

Answer 1

It is probably true for your purposes.

Sudhan, Newton's third law does hold true in other frames of reference too.

The only case where it doesn't appear to hold true has been explained with quantum field theory. Take, for example, the laser cavity. What causes spontaneous emissionof radiation initially? Well, the action seems to be totally random and, therefore, an action without cause. It was then realised that this cause did exist in the form of virtual photons popping into existence and disappearing again in such a short time that the uncertainty principal isn't violated.

Remember, conservation of energy and momentum can be violated as long as the uncertainty principal isn't!

Anyway, the only case where Newton's third law doesn't hold true is that these virtual photons seem to appear and disappear without cause. This is in the process of being tested against a version of string theory that may offer an explanation.

Answer 2

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This law has been extensively observed and validated through countless experiments, making it a fundamental principle in classical mechanics.