Do we have momentum through time and does gravity affect it?

[Mr Peanut]

OK, time (or perhaps sqrt(-1) X time) is our fourth dimension. Do we have momentum as we move through time? When we encounter a gravitational field, does it act to accelerate (decelerate) our "velocity" through time?

 

[CompuChip]

Are you talking about four-momentum?

 

[dx]

The time-momentum is just the energy! In relativistic physics, energy and the three space components of momentum are viewed as a single entity called 4-momentum. Even in non-relativistic physics, there are indications that energy and momentum have very similar nature (see books on advanced mechanics).