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What is the difference between gravity potential, and gravity potential energy?Do they have different values?
Quote from: timey on 04/03/2017 05:49:06What is the difference between gravity potential, and gravity potential energy?Do they have different values?gravitational potential is gravitational potential energy per unit of mass. If the gravitational potential energy is measured in kgm^2/s^2 then the gravitational potential is m^2/s^2 . Thus if you have two masses in the same position in a gravity field and one is twice the mass of the other, they both have the same gravitational potential, but one would have twice the gravitational potential energy.
So Janus - In the case of light falling towards body M, we can understand that as the photons are the equal of each other at each coordinate within the gravity potential well, and all travelling at the same speed, ie: c, that all photons are affected equally.
And that when m's of differing mass value are free falling towards M, the gravity potential, and resulting gravity potential energy decrease for m in free fall is going to be differing for m's of differing values of mass.
I know you cannot explain why this happens because it is not currently known why all values of m accelerate at the same rate in free fall.
But... the mass or relativistic mass value for m and light, respectively, are used in calculation to describe momentum, or p in the maths.
What exactly is the physical description of momentum?
Oh for goodness sake Jeff - grow up!Momentum is being calculated in the way I mentioned many posts ago.What is the physical action of the use of p in the maths?Clearly there is a force that is causing momentum and the use of momentum, ie: p, is describing this force mathematically...But what is that force of momentum please?Can you give me a physical description?
Quote from: timey on 04/03/2017 18:37:49Oh for goodness sake Jeff - grow up!Momentum is being calculated in the way I mentioned many posts ago.What is the physical action of the use of p in the maths?Clearly there is a force that is causing momentum and the use of momentum, ie: p, is describing this force mathematically...But what is that force of momentum please?Can you give me a physical description?Just one last point before I go. If you have constant momentum there is no force. It follows Newton's laws.