You are here:




Am I right to surmise that the kinematics and Newton's 2nd law hold only for inertial frames of reference and since when we move ,...we accelerate and slow down all the time. So for most real world situations, the "Laws" do not apply?

Happy New Year !!

No, for almost every real-world situation these laws do indeed apply.  There are situations at very high velocities and very high gravitation where relativity comes into play, but those situations are definitely the exception and not the rule.  Ancient greek notions that objects in motion would just "naturally" come to rest definitely set real physics back quite substantially.


All Answers

Answers by Expert:

Ask Experts


Dr. Stephen O. Nelson


I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.


I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

©2017 All rights reserved.

[an error occurred while processing this directive]