Astronauts float inside the Space Station not because gravity has switched off — up there it is still nearly as strong as on the ground. They are in continuous free fall, and so is everything around them, so nothing presses back. That is weightlessness.
The orbiting disc is in continuous free fall — gravity pulls it the whole time, but its sideways speed keeps it missing the centre. An astronaut riding along would fall at exactly the same rate, press on nothing, and float: weightless.
Weightlessness is the feeling of having no weight pressing on a support. It happens in free fall, when gravity is the only force acting. Your actual weight — the gravitational pull — is still there. What disappears is the support force that normally pushes back on you. With nothing pushing back, you float relative to your surroundings.
Standing still, the ground pushes up on you with a force equal to your weight — that upward push is what you actually feel. In free fall you and everything around you accelerate downward together at the same rate, g, so there is no relative motion and no support force; a scale beneath you reads zero. Gravity has not gone anywhere — the contact force has.
In The Field the disc is in perpetual free fall toward the sun, but its sideways speed keeps it missing, so it orbits instead of landing. An astronaut riding inside would float: astronaut and disc fall together at the same rate, so neither presses on the other. An orbit is simply falling forever and always missing the ground.
Weightlessness clicks when you watch a scale drop to zero the instant the floor stops pushing back — even though gravity never changed.
The scale reads weight only because the floor pushes up. In free fall the floor falls away with you, the push vanishes, and the reading drops to zero — gravity unchanged the whole time.
Astronauts float because the station and everyone in it are in continuous free fall around Earth. Gravity is still strong up there — about 90% of its surface value — but with everything falling together, nothing presses back.
For the few seconds the car plunges, you and the seat fall together at the same rate. The seat stops pushing up, your stomach lifts, and you feel briefly weightless — free fall on a fairground scale.
A training aircraft flies a steep up-and-over arc, following a free-fall path through the air. For about 25 seconds everyone inside floats, which is how astronauts and film crews rehearse weightlessness without leaving the atmosphere.
Weightlessness is one of the most misunderstood ideas in physics — it is about free fall, not the absence of gravity. This FAQ runs from astronauts and dropped lifts to apparent weight, microgravity, and why orbiting is just falling and missing the ground.
Weightlessness is the feeling of having nothing pressing back on you, which happens whenever you are in free fall. Normally the ground or a chair pushes up on you, and that push is what you feel as your weight. In free fall there is no such push, so you float. Gravity is still pulling on you the whole time; it is only the support force that has gone.
No — this is the biggest misconception about space. At the height of the Space Station, Earth's gravity is still about 90% as strong as on the ground. Astronauts float because they, and the station, are in continuous free fall around Earth, all falling at the same rate. With everything falling together, nothing presses on anything else, so they feel weightless even though gravity is very much present.
Free fall is motion under gravity alone, with no other force such as a support or air resistance acting. In free fall every object accelerates downward at the same rate, g, regardless of its mass. Because everything around you is accelerating identically, there is no relative motion and no contact push between you and your surroundings — which is exactly what produces the weightless sensation.
| Idea | What it means | Where |
|---|---|---|
| Weightless | No support force; you are in free fall | Orbit, falling lift, parabolic flight |
| Zero gravity | No gravitational force at all | Only far from every mass |
A scale measures the support force it has to push up with, not gravity directly. Standing still, it must push up with a force equal to your weight, so it reads mg. In free fall the scale falls with you at the same rate, so it no longer needs to push up at all — the support force drops to zero and so does the reading. Your actual weight, the gravitational pull, has not changed.
Apparent weight is the support force you actually feel, which can be more or less than your true weight. In a lift accelerating with acceleration a (taking up as positive), it equals m(g + a). At rest, a is zero and you feel your normal weight mg. Accelerating upward, you feel heavier; accelerating downward, lighter; and in free fall, where a equals minus g, the apparent weight is zero.
No. The proper term is microgravity. Gravity at the station's altitude is still about 90% of its surface strength, which is exactly what holds the station in orbit. The tiny residual accelerations — from air drag, tides, and crew movement — are far smaller than g, so experiments behave as if nearly weightless, but it is not true zero gravity.
An orbiting object is genuinely falling toward Earth the whole time — but it also moves sideways so fast that the ground curves away beneath it just as quickly as it falls. The result is that it keeps falling and keeps missing, looping around forever. Newton imagined a cannon fired so hard the ball falls right around the planet. Astronauts are in that endless fall, which is why they are weightless.
Whenever you and your seat fall together with nothing pushing up, you are momentarily in free fall and feel weightless. On a coaster's sharp drop, or in a lift whose cable is released, the floor accelerates downward as fast as you do, so it stops pressing on you. Your stomach seems to lift because the usual support force, which your organs are used to, briefly disappears.
No. Mass is the amount of matter in you and it never changes, whether you are on Earth, on the Moon, or floating in orbit. What changes is the support force you feel, which can drop to zero in free fall. A weightless astronaut still has their full mass, which is why it still takes a real push to get them moving and a real push to stop them.
Because in free fall every object accelerates at the same g, regardless of mass. On Earth a feather drifts only because air resistance holds it back; remove the air and the feather and hammer fall side by side. Astronauts famously demonstrated this on the Moon, where there is no air. This equal rate of fall is exactly why everything in a falling lift or an orbiting station floats together.
Any force other than gravity ends free fall. Hit the ground and the floor pushes up, restoring the support force and your weight. In air, drag builds as you speed up until, at terminal velocity, it balances gravity — then you are no longer accelerating freely and you feel your weight through the air's push. Free fall lasts only while gravity is the sole force acting.
Einstein noticed that a person in free fall feels exactly as they would with no gravity at all — and that someone in an accelerating rocket feels exactly as if gravity were pulling them. This equivalence between free fall and weightlessness, and between acceleration and gravity, became a founding principle of his general theory of relativity, which reimagines gravity as the curving of space and time.
Not while something supports you. Standing, sitting, or lying down, a surface pushes up on you and you feel your weight. You can only be weightless on Earth during free fall — a jump, a dive, a dropped lift, or a parabolic flight — and only until something stops you or air resistance builds up. The sensation is real but always brief near the ground.
Microgravity on orbiting stations lets scientists grow purer crystals, study flames and fluids without buoyancy, and learn how the body copes without the steady pull it evolved with. Engineers design spacecraft and experiments around free fall, and trainers use parabolic flights and drop towers to rehearse it. Understanding that weightlessness is free fall, not absent gravity, is essential to all of it.
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