Angular momentum

Hi! Please, could someone tell me who defined angular momentum as r x P? Thank you.

Peter57

 

I want to know who defined angular momentum as r x p. That is all,

 

Thank you. Could you please give me some reference? It doesn't seem it was Newton who used it first.

 

Thank you very much. But would you know if Aristotle himself defined angular momentum as r x p? If he did not do it, somebody else must have done it. I would like to know who did it and why. I have reason to believe this definition is incorrect.

 

I found an experiment where r x p is not conserved when, clearly, no external torque acts on the object.

 

I think you are right. It is funny, although I have been asking far and wide, it seems nobody knows who was the first to use r x p.

 

I know physics textbooks teach angular momentum is mr^2w, but that is incorrect. For a point mass it is mrw. I wrote a paper on this subject, and a physics journal is now considering its publication.

 

According to Newton's second law F(net) = dp/dt, only a net force in the direction of motion of an object, can change the magnitude of its velocity. A force perpendicular to the direction of motion of an object, does not change the magnitude of its velocity. If this were not true, a rotating object at the end of a string would increase its speed constantly, because it is subject to a constant centripetal force.

 

I am sorry to upset you, but I found an experiment that shows the currently accepted definition of angular momentum r x p is incorrect. That is why I was interested in knowing who defined angular momentum as r x p and why. Unfortunately, I have been unable to do it, so far at least. Anyway, I understand that, in physics, the experimental truth has the last word, and that should not be suppressed.

 

I am not questioning conservation of angular momentum at all, as I am not questioning the conservation of linear momentum. According to Webster's dictionary, momentum is: a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity.

The way I understand it, angular momentum should be the momentum of an object in circular motion. In other words, linear and angular momentum are not two different kinds of momentum; they are the same thing. But linear and angular momentum, as currently understood, are two different kinds of momentum, with different units and different conservation laws; moreover, while linear momentum is a true vector, angular momentum is not, it is pseudovector, i.e., not a vector.

At this time, I cannot describe the experiment, because an application for a patent is in process, but I will as soon as I can.

 

Thank you. I will describe the experiment as soon as I can. In the meantime, do you agree that, according to Newton's second law F(net) = dp/dt, only a net force in the direction of motion of an object can change the magnitude of its velocity? In other words, a radial force on an object, like a satellite in a circular orbit, cannot change the magnitude of its velocity. I think this must be true; otherwise, the speed of a satellite in a circular orbit would increase constantly.

 

I will as soon as it is published, if it is published.

 

O. K. I agree.