The principle here is known as the conservation of momentum.

It is easy to understand why if one considers conservation of momentum.

This, in turn, suggests that space drive research must address conservation of momentum.

The area law as a case of angular momentum conservation.

Unfortunately, we'd still need to use conservation of momentum to figure out whether is positive or negative.

We set it moving to determine if conservation of momentum holds.

Three basic concepts drive almost everything else in the field: the conservation of mass, energy, and momentum.

The equations above represent conservation of mass, momentum, and energy.

As a result, they go in all directions (conservation of horizontal momentum).

The reason for this is the conservation of momentum.