What is momentum?
Momentum is what a moving pattern hands along from step to step, a current that must cross every junction on its route and can never vanish in one place and turn up in another. In 1742 Benjamin Robins fired a musket ball into a board on a hanging iron plate. The plate swung, and the ribbon the swing dragged through a clamp gave the ball's speed, 1,670 feet per second. A moving object here is a chain of readings, each step carrying mass times the size of the step. Where ball and plate touch, one step ends the ball's chain and begins the plate's, and a step carries one number, so the plate leaves with what the ball brought. Momentum is conserved because the rule that settles disagreements works the same wherever it acts.
Also in Chapter 35: What Is Anything Made Of?.
This answer comes from OPH, Observer Patch Holography. OPH is a rigorous, consistent and complete description of the unified, self-creating computational Universe we inhabit. Its consistency is machine-checked: the fixed point at its core is constructed explicitly, and a theory with a model contains no contradiction.
To understand OPH and check every step yourself, start with the free book Reverse Engineering Reality. It builds the theory from the ground up, and the OPH Notebook answers your questions while you read.
read the free bookask the notebookor ask sage:read chapter 32: Why Does Anything Move?watch a universe make its own particles