What is weightlessness
It would seem that everything is simple here. Weightlessness is when you weigh anything. You can, like a bird, flush into the window – or spin under the ceiling, like shorties in Nosov’s book “Dunno on the Moon”. But why then in zero gravity, hitting his forehead against the wall, the astronaut (without a spacesuit) will fill his bump in the same way as any schoolboy in the yard? After all, he, as it were, “weighs nothing”, which means that he probably cannot bruise? Or maybe?
What is weightlessness
Physics “weight” call the power with which any body acts on the surface of its support (or suspension). Suppose a person sits on a chair, and the weight is the severity with which the body is based on this chair. The apple lies on the table, then the weight of the apple that acts on the surface of the table under it will be weighed. However, in some circumstances, the weight disappears, and an apple instead of a calm lying on the table suddenly begins to smoothly fly around the room. Why is it happening to him? Suddenly, suddenly, as in a fairy tale, the weight cannot “leave”: although in a fairy tale about shorties there is a “device of weightlessness”, while nothing like this has been invented in reality. However, weightlessness can be found or created.
Weightlessness occurs in two different cases. She appears in space because we also moved away from the Earth and other large celestial bodies that could attract with gravitational forces. Sometimes the weightlessness of this origin is also called “microgravity”. But you can create weightlessness and artificially. Scientists do this more often – for research purposes, for example, in order to study well the behavior of animals or bacteria in zero gravity. Occasionally, the effect of temporary zero gravity is created for entertainment purposes, say, in flights in the so -called aerotherapy. There they “fly” on the flows of air, hitting from the bottom up and with their power overcoming the strength of the severity.
What is weightlessness
Body weight can, unlike the mass, change under the influence of acceleration. For example, in a speed elevator, when it moves up it, we feel harder than usual, and if the same “speed” carries us down, it seems to us that the body becomes easier. It is on this effect that the creation of zero gravity is based on an “artificial way”. Когда самолёт быстро и резко устремляется вниз, у него внутри пассажиры или подопытные животные могут себя ощутить в невесомости, и даже «поплавать» по салону, как в космическом корабле. This effect is used both in the preparation of astronauts, and when studying the reaction of living creatures to a temporary lack of gravity. In such “zero gravity” various scientific experiments are conducted, which may be the progress of mankind in the future. And to create artificial “zero gravity”, it is necessary that the acceleration of the aircraft flying down is to accelerate the free fall of the body or there is even a little more. But namely-only just a little bit, otherwise all the experimental “stick to the ceiling” and there will already be a kind of “reverse gravity”. The speed for experiments with weightlessness is therefore calculated very accurately and subtly – so that no one “smears” about the ceiling.
Nevertheless, if in such zero gravity you quickly swim to the wall or object, you can crack tightly about it with your shoulder, forehead or other part of the body. The catch is that to the ground – or another planet, for example, to the Moon or Mars, if we got there, we are attracted by gravity that creates our weight. And pain when impacting a forehead or any other part of the body about the subject is the “tricks” of the mass. What is the difference between them?
What is weightlessness
The word “weightlessness” is also used in a figurative sense. For example, some very light object can be called weightless. It can be cotton wool, feather or tender cloud. In fact, of course, there is always weight, but the word “weightless” is taken to show how small and invisible it is. Sometimes a sensation of weightlessness is also called strong “inspiring” emotions – inspiration, delight or love.
