vector momentum การใช้

Where the integral is performed over all possible values of the 3-vector momentum " k ".
In his 1905 paper, Einstein used the additional principles that Newtonian mechanics should hold for slow velocities, so that there is one energy scalar and one three-vector momentum at slow velocities, and that the conservation law for energy and momentum is exactly true in relativity.
I was imagining it as a movement that had forces similar to orbital mechanics, in which the " pull " toward the " centre " ( i . e . " gravity " ) and the resulting inward centripetal acceleration ( caused both by the running toward the centre and the linking of arms ) exactly balances out the outward tangential acceleration ( imparted by the vector momentum, which is the force I am asking for whether it would result from this theoretical set-up ).