Intro

Retrocausality - That future can effect the past. Ex - if I spill the coffee tomorrow then I can see the stain today.

Momentum

In Newtonian mechanics, linear momentum, translational momentum, or simply momentum(pl. momenta) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction in three-dimensional space. Ifmis an object's mass andvis the velocity (also a vector), then the momentum is

p = mv

In SI units, it is measured in kilogram meters per second(kg⋅m/s).Newton's second law of motion states that a body's rate of change in momentum is equal to the net force acting on it.

Momentum depends on the frame of reference, but in any inertial frame it is aconservedquantity, meaning that if a closed system is not affected by external forces, its total linear momentum does not change. Momentum is also conserved in special relativity, (with a modified formula) and, in a modified form, in electrodynamics, quantum mechanics, quantum field theory, and general relativity. It is an expression of one of the fundamental symmetries of space and time:translational symmetry.

Advanced formulations of classical mechanics, Lagrangian and Hamiltonian mechanics, allow one to choose coordinate systems that incorporate symmetries and constraints. In these systems the conserved quantity isgeneralized momentum, and in general this is different from thekineticmomentum defined above. The concept of generalized momentum is carried over into quantum mechanics, where it becomes an operator on a wave function. The momentum and position operators are related by the Heisenberg uncertainty principle.

In continuous systems such as electromagnetic fields, fluids and deformable bodies, a momentum density can be defined, and a continuum version of the conservation of momentum leads to equations such as the Navier--Stokes equations for fluids or the Cauchy momentum equation for deformable solids or fluids.

https://en.wikipedia.org/wiki/Momentum