Why does a moving object keep moving? - The secrete of Inertia
Why Does a Moving Object Keep Moving?
The question Newton left unanswered — and what the universe's expansion has to do with it
A hockey puck slides across frictionless ice. It doesn't slow down. It doesn't stop. It keeps going — indefinitely. Everyone accepts this. Nobody explains it.
Newton's first law of motion — a body in uniform motion continues unless acted upon by an external force — is among the most tested statements in all of physics. But here is what textbooks quietly skip over: why does the velocity persist? What maintains it? The law describes what happens. It offers no mechanism.
For three centuries, this has been treated as a primitive axiom — a given, not a theorem. My Expansion Freedom Theory (EFT) proposes that this is a mistake, and that the answer has been hiding in plain sight: the universe is expanding.
Velocity Is a Ratio
When object A pushes object B, a relative displacement Δx is created between them. The velocity that results is a ratio — displacement per unit time:
This seems trivial. It is not. Ratios are not absolute quantities. They are geometric relationships — angles, in the most general sense. And ratios have a remarkable property when the universe expands.
The Conformal Effect
When the universe expands uniformly, every length scale grows together. Rulers expand with space. Absolute sizes become invisible. Only ratios — shapes, angles, proportions — survive unchanged. This is called the conformal effect: universal expansion is shape-preserving.
"Universal expansion is shape-preserving. And velocity is a shape — a ratio. Therefore velocity is preserved by expansion itself."
Apply this to the velocity ratio. As the universe expands, both Δx and Δt scale proportionally. Their ratio v = Δx/Δt is preserved — without any sustaining force, without any mechanism, simply because ratios are conformal invariants.
Velocity = ratio = conformal invariant. The conformal effect preserves ratios under universal expansion. Therefore velocity, once created by an impulse, is maintained by expansion itself. Newton's first law is not an axiom — it is a theorem of conformal geometry applied to an expanding universe.
The Reversal: A New Argument for Expansion
Space Expansion and Hubble Expansion: Two Different Things
The conformal effect tells us that basic space expansion is invisible from inside the universe — every ruler expands with space, so ratios are preserved and nothing appears to change. Yet we observe Hubble redshift. Is this a contradiction?
It is not, because the two phenomena involve different observation conditions. The conformal effect applies when observer and observed share the same epoch — same moment, same ruler, same expansion state. Hubble observation does not. When we look across cosmic distances, we receive light that left its source billions of years ago, in a different expansion state, and measure it with present-day rulers. The mismatch between past and present expansion states is what redshift captures. v = Hr is not expansion speed; it is the accumulated difference between epochs, made visible by the asymmetry of observation.
The paper described redshift as the result of "long accumulation." That is not wrong, but accumulation alone does not defeat the conformal effect — only the cross-epoch observation geometry does.
What Follows
This is only the beginning. From inertia as a conformal invariant, EFT derives gravity as expansion parallax — the lag ε = GM/rc² between space and matter that cannot freely follow the expansion. The equivalence principle, the constancy of c, galactic rotation curves without dark matter — all emerge from the same source.
The constancy of the speed of light, usually taken as a postulate of special relativity, becomes a structural ratio of expansion — analogous to π (circumference over diameter, fixed regardless of circle size). It cannot be otherwise.
Gravity, in this view, is not a force. It is what an observer inside an expanding universe perceives as attraction when matter lags behind space. No graviton may exist. Searching for one is like searching for the force particle at the back of an accelerating bus.
The full paper (v6.8.2) — including galactic rotation curves, the Bernoulli expansion-freedom mechanism, and the three-layer structure of the Hubble law — is freely available on Zenodo. What began with a hockey puck unfolds into a complete cosmological framework.
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