# In theoretical physics, is the Graviton related to the fundamentals behind the $F = ma$ relationship?

If the Graviton transmits the gravitational force to nuclei within atoms, and an object with mass gains energy by being accelerated (change velocity / change time), does that imply that $$F = ma$$ is caused by the interaction between Gravitons and nuclei of the object?

I've for a long time been in disdain over the concept of potential energy, and it would seem like the answer to this question would be yes if you only considered the $$y$$-axis considerations. If you lifted an object 10 meters, we would say it had gained some amount of potential energy. It seems like the reason behind that potential energy is the underlying fundamentals of what causes 'F = ma', where the gravitational field simply decelerates the object as it is lifted.

One problem with this however, is that 'F = ma' also applies to horizontal movement not affected by potential energy. So Gravitons would need to also affect nuclei even if they are accelerated across an unvarying gravitational field. I'm not sure how to justify this inconsistency which is why I'm curious. Any answers are appreciated.

• "F=ma" is from Newtonian mechanics. Gravitons are from some as yet unknown quantum theory of gravity. Gravitons are so far beyond the scope of Newtonian mechanics that it's hard to answer this question. However, there are a lot of interactions other than gravity in nature - so it wouldn't make sense if all "forces" in the sense of "F=ma" come from Gravitons. – enumaris Sep 27 '18 at 22:38

No, but you can relate Newton's second law of motion $$(1)$$ to Newton's law of gravity $$(2)$$. Instead of gravitons, just think of a gravitational field $$\phi$$.
$$(1)$$ $$F = m_i a$$ tells us an object's acceleration when a force is applied. $$m_i$$ is the inertial mass. It is the characteristic of a system to resist acceleration.
$$(2)$$ $$F = - m_g\nabla \phi$$ tells us the motion of the object under a gravitational potential $$\phi$$. $$m_g$$ is the gravitational mass. It is the characteristic of the system that tells it how to react in a gravitational field.
A priori, $$m_i$$ and $$m_g$$ signify different characteristics. But as was noticed by Newton, Galileo and others, objects of different masses/compositions fall at the same rate of acceleration under a gravitational field. It was therefore postulated that $$m_i = m_g$$. This has been experimentally tested to very high accuracy.
Assuming the equality of $$m_i = m_g = m$$, $$(1)$$ and $$(2)$$ can be combined such that we get $$m(a + \nabla \phi) = 0$$. In other words, in the freely falling frame, an object does not experience any 'force'.