Philip Hampsheir | 29 March 2026

This is a short article about a very simple observation. It is simple enough that a bright sixteen-year-old could make it. The fact that, as far as I can determine, no physicist has formally made it in three hundred and thirty-nine years is either evidence that I am missing something blindingly obvious, or evidence that everyone else is.

I genuinely don’t know which.

The Argument

Newton’s first law of motion, published in 1687, states that an object at rest remains at rest, and an object in motion remains in motion at constant speed in a straight line, unless acted upon by a force.

This is the definition of inertia. It tells us two things. First, that objects do not change their state of motion spontaneously. Second — and this is the important part — that inertia *preserves* a state of motion. It does not *initiate* one.

If something is moving and nothing is pushing it, inertia explains why it keeps moving. But inertia does not explain why it started moving in the first place. For that, you need a force.

Now: everything in the universe moves through time. Every particle, every field, every point in spacetime. Nothing stops. Nothing reverses. Nothing is exempt. This is the single most universal form of motion in physics. It is more universal than gravity, which weakens with distance. More universal than electromagnetism, which can be shielded. More universal than the strong and weak nuclear forces, which operate only at subatomic scales. The motion through time gets everything, everywhere, always, without exception and without escape.

By Newton’s own definition, this motion requires a force.

That’s it. That’s the argument.

Why the Obvious Objections Don’t Work

I am not a physicist. I have a degree in Government and Economics from the LSE and nearly three decades of experience in journalism. I am therefore exactly the sort of person who should be dismissed when making claims about fundamental physics, and I would not blame you for doing so. But the argument doesn’t depend on my credentials. It depends on Newton’s. So let me address the objections that immediately arise, because they arose in my own head first.

“Time is a dimension, not a force.”

This is the standard response. It sounds solid. It is the answer given by Stanford’s Gravity Probe B FAQ, by Physics Forums moderators, and by the general consensus of working physicists.

But here is the problem with it: it tells you how time has been *categorised*. It does not explain what enforces the forward direction, the universality, the absolute lack of exceptions. And — more importantly — it relies on a categorical distinction that physics itself has already shown to be porous.

General Relativity demonstrated that what Newton called a *force* — gravity — is actually geometry. The thing everyone agreed was a force turned out to be the curvature of spacetime wearing a force’s clothes. The border between “force” and “dimension” is not a wall. Physics knocked it down in 1915. If gravity can turn out to be geometry, it is not obviously absurd to ask whether time might turn out to be a force. The categorical door swings both ways. Saying “time is a dimension, not a force” as though the distinction is settled and inviolable is ignoring what GR already did to it.

“Motion through time is inertial. It’s the default state. No force is needed.”

This restates the problem without solving it. *Why* is it the default state? Inertia preserves existing motion. It does not explain why the motion exists. What started everything moving through time? What sustains it? “It just does” is not physics. It is the absence of physics on this specific question.

You could, if pressed, attempt to argue that motion through time has always existed and therefore requires no initiating force — it is simply the eternal state of things. But this is precisely the kind of argument that physics rightly rejects in every other context. If someone said “the planets have always been orbiting, so no force is needed to keep them orbiting,” they would be laughed out of the room. Orbits require gravity. Motion requires a cause. Except, apparently, when the motion is through time, at which point we all agree to stop asking.

“This is a category error. Newton was talking about spatial motion.”**

Newton was talking about motion. He did not distinguish between spatial and temporal motion because he didn’t know they were aspects of the same thing. He lacked the framework of General Relativity. We do not. Applying his law to all components of motion through spacetime is not a category error. It is the logical completion of his framework in light of information he did not have.

“A force requires a carrier particle. Where is the boson?”

This objection imports the specific mathematical framework of quantum field theory into an argument that predates it by three centuries and does not require it. QFT defines forces in terms of gauge symmetries and exchange particles. Newton defined force as that which compels or alters motion. The QFT definition is narrower, model-dependent, and — critically — does not yet include gravity, which is universally acknowledged as a force despite the fact that no one has ever detected a graviton. If gravity gets to be called a force without a confirmed carrier particle, demanding one before you’ll extend the same courtesy to time is applying a double standard.

Besides: I can push a box across a table. What’s the carrier particle for that? An I-Touched-It-Ion?

The Apple

Consider an apple on a tree. The standard account says it falls because gravity acts on its centre of mass. But here is a more precise account, and it is not speculation — it is settled, if underemphasised, physics.

Gravitational time dilation is real and measured. Clocks run slower closer to a massive object. This means the bottom of the apple — fractionally closer to the Earth’s centre — is moving through time slightly slower than the top. There is a time differential across the apple’s diameter. The apple falls not because a force is pulling uniformly on its mass, but because it is sitting in a gradient of time. It moves toward where time runs slowest.

This is not a poetic restatement of standard gravity. It is a different description of the same phenomenon — and it is a description in which time is doing the work. The spatial motion of the apple is the *consequence*. The temporal gradient is the *cause*.

If you are comfortable with that framing — and you should be, because it is experimentally indistinguishable from standard GR — then you are already most of the way to time being a force. The apple falls *down* the time gradient. Gravity is the local variation in the rate of the time-force. What we have been calling a gravitational field is the observable shape of something that time is doing.

What This Implies If Taken Seriously

I want to be careful here. The argument above is, I believe, logically valid on its own terms. What follows is more speculative — a sketch of where the argument leads if you follow it.

The arrow of time stops being a mystery. This is the implication I find hardest to dismiss. The fundamental equations of physics — Newtonian, relativistic, quantum — are time-symmetric. They run equally well in both directions. The arrow of time is conventionally explained by the second law of thermodynamics: entropy increases, and that increase defines a direction. But this requires assuming special initial conditions — a low-entropy Big Bang — to get the arrow pointing the right way. You are, in effect, explaining why time points forward by noting that it started pointing forward. That is not an explanation. It is a restatement dressed as one.

If time is a force, the arrow is not a statistical artefact requiring special pleading about cosmological initial conditions. It is a *property of the force*. Forces have directions. This one points one way. The arrow of time is not something that needs explaining any more than the direction of gravity needs explaining. It is intrinsic to what the force is. If this is correct, one of physics’ longest-standing open problems dissolves not through new mathematics but through a reclassification.

Gravity may not be a separate force. Einstein already told us gravity is not a force in the Newtonian sense — it is the curvature of spacetime. Objects in free fall follow geodesics. No force is required. The reason you feel gravity standing on the ground is not because gravity is pulling you down. It is because the ground is accelerating you upward, off your geodesic. This is standard General Relativity, not speculation.

Now: the only thing in physics that modifies the rate at which time passes is what we call a gravitational field. Clocks run slower near mass. GPS satellites must correct for this. This is gravitational time dilation, and it is one of the most precisely confirmed predictions in all of physics.

If time is a force, and gravity is the only thing that alters its strength, then what we have been calling gravity may simply be the local variation in the time-force. Gravitational time dilation is not a curious side effect of curved spacetime. It is the primary phenomenon. The spatial curvature — the bending of light, the warping of orbits — is the side effect.

The hierarchy problem dissolves. Physics has long been troubled by the fact that gravity is approximately 10³⁶ times weaker than electromagnetism. This is the hierarchy problem, and it has generated decades of theoretical work attempting to explain the discrepancy. But if gravity is not a force in the same category as electromagnetism, the strong force, and the weak force — if it is instead the observable consequence of time varying locally — then comparing their magnitudes is a category error. You are not comparing four forces and finding one implausibly weak. You are comparing three forces to something that is not a force at all, and being surprised the numbers don’t match. Of course they don’t. You are comparing apples to the concept of Tuesday.

The standard model is incomplete in a specific way. Physics currently recognises four fundamental forces. None of them is time. If time is a force — or behaves indistinguishably from one — then either it is a fifth force that has been hiding in plain sight because it was categorised as a dimension before anyone had reason to question the category, or physics lacks a category for it entirely. A dimension that acts as a force. Or a force that presents as a dimension. The distinction may not be physically meaningful.

The Meta-Question

The most important question about this observation is not whether it is correct. It is why nobody has made it before — or rather, why, on the few occasions someone has raised it in an online forum, it has been shut down with “time is a dimension, not a force” without anyone engaging with the actual logic.

I can think of three possibilities.

First: I am wrong, and the error is so obvious that no physicist has ever needed to articulate it. This is entirely possible. I am not a physicist. I may be making a mistake so elementary that it doesn’t merit a published rebuttal. If so, I would genuinely like to know what it is, because I have been unable to find it.

Second: the categorisation of time as a dimension is so deeply embedded in the foundations of physics — set in the seventeenth century before anyone had reason to question it, reinforced in the twentieth by its successful incorporation into spacetime geometry — that it has become invisible. It is not defended because it is not questioned. It is not questioned because it is not seen. The fish does not notice the water.

Third: someone has made this argument, rigorously and formally, and I simply haven’t found it. If so, I would be grateful to be pointed toward it. I have searched. I have not found.

In any case, the syllogism stands until someone breaks it:

1. Newton’s first law: motion requires a force to initiate and sustain it.
2. Everything in the universe moves through time.
3. Therefore, something is forcing that motion.
4. That something acts universally, unidirectionally, and without exception.
5. These are the properties of a force.

I don’t know what to do with this. But I can’t make it go away. And in my experience, that is usually worth paying attention to.

Philip Hampsheir is a journalist, novelist, and the creator of A Piece of the Past on YouTube. He is not a physicist, a fact he suspects may be either his greatest disadvantage or his only advantage in this particular argument.