impetu fu'ivla

x₁ is the momentum [vector] of x₂ in frame of reference x₃

x₁ can be a vector, e.g. four-vector. Might be pretty general in its semantic scope ("quantity of movement"); at the very least includes both Relativistic (four-vector) and Newtonian (three-vector) momentum (resp.: nejnimpetu, sirmpetu); might also encompass angular momentum (cnampetu, typically three-vector). See also nejni, nejnimpetu, sirmpetu, ocnerta, tcelerita, cnampetu

jbovlaste

In notes:

cnampetu: x₁ is the angular momentum [vector] of x₂ in frame of reference x₃ around point/axis of reference x₄.
nejnimpetu: x₁ is the linear-momentum-energy-mass [four-vector] of x₂ in frame of reference x₃
ocnerta: x₁ is a physically-required conserved quantity in an ideal closed system such that it is associated with (Noetherian) symmetry/Hamiltonian-commuting observable/deterministic feature/law/property/aspect x₂, applicable under conditions/in universe/in metaphysics x₃
sirmpetu: x₁ is the [probably spatial] linear momentum [vector] of x₂ in frame of reference x₃