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Evidence Against Gravity Being Absolute
- Thread starter SheikhHorusFromTheSky
- Start date
If it is, I'm just as guilty.
Daemon Sophic
Avatar in flux
:yes: As soon as I read the title, I thought that was what this was all about.
I wish I had read no further.
dust1n
Zindīq
The reason a rocket launches and doesn't come down is because the propulsion from the jet fuel is stronger then the strength of Earth's gravity. It just takes a certain velocity. How do you think people sent rocket's in space? They did it by beating gravity's force, not by acting as if gravity didn't exist.
"Although the Earth's gravity has a lesser effect on an astronaut orbiting the Earth in a spaceship than on a person on the surface of the Earth, this is not the reason why an astronaut experiences weightlessness. The space shuttle, International Space Station and most other manned vehicles don't get that far from the Earth. The Earth's gravitational attraction at those altitudes is only about 11% less than it is at the Earth's surface. If you had a ladder that could reach as high as the shuttle's orbit, your weight would be 11% less at the top. Put another way, a person who weighs 100 pounds on the Earth's surface would weigh about 89 pounds at the top of the ladder.
The reason why the person wouldn't feel weightless is because they are being pushed by the ladder - it is keeping them from falling. If they were to jump off the ladder, then they would feel weightless, at least up until the time they splatted on the ground. This is why astronauts feel weightless. The astronaut, the spaceship and everything inside it are falling towards the Earth. The reason why the astronaut doesn't go splat is because the Earth is curved and the astronaut, the spaceship and everything inside it are moving 'sideways' fast enough that, as they fall towards the Earth, the surface of the Earth curves away from them. They are always falling towards the Earth, but they never get there.
The reason why you don't see gravitational effects between objects in a spacecraft is because gravity is a very, very weak force. Of the four basic forces that scientists are sure about, gravity is, by far, the weakest one. Have you ever tripped and fallen down? Well, it took the whole planet to do that to you. Have you ever seen a sock stick to a shirt after it has come out of a dryer? That static cling, created by a slight imbalance of charge between the sock and the shirt, is stronger than the gravitational attraction of the Earth. The gravitational attraction between two small objects in a spacecraft would be overwhelmed by other forces, such as the force of the air being circulated throughout the spacecraft. Although the force of attraction is there, it is so weak that special care would have to be taken to notice it."
In space we feel weightlessness because...
All life forms are subjected to gravity. A bird is able to fly because:
Unpowered aerial locomotion
These modes of locomotion typically require an animal start from a raised location, converting that potential energy into kinetic energy and using aerodynamic forces to control trajectory and angle of descent. Energy is continually lost to drag without being replaced, thus these methods of locomotion have limited range and duration.
- Falling: decreasing altitude under the force of gravity, using no adaptations to increase drag or provide lift.
- Parachuting: falling at an angle greater than 45° from the horizontal with adaptations to increase drag forces. Very small animals may be carried up by the wind. Some gliding animals may use their gliding membranes for drag rather than lift, to safely descend.
- Gliding flight: falling at an angle less than 45° from the horizontal with lift from adapted aerofoil membranes. This allows slowly falling directed horizontal movement, with streamlining to decrease drag forces for aerofoil efficiency and often with some maneuverability in air. Gliding animals have a lower aspect ratio (wing length/breadth) than true flyers.
Powered flight has evolved only 4 times (birds, bats, pterosaurs, and insects), and uses muscular power to generate aerodynamic forces and replace energy lost to drag.
- Flapping: moving wings for directly producing thrust. May ascend without the aid of the wind, as opposed to gliders and parachuters.
Ballooning and soaring are not powered by muscle, but rather by external aerodynamic sources of energy: the wind and rising thermals, respectively. Both can continue as long as the source of external power is present. Soaring is typically only seen in species capable of powered flight, as it requires extremely large wings.
- Ballooning: being carried up into the air from the aerodynamic effect on long strands of silk in the wind. Certain silk-producing arthropods, mostly small or young spiders, secrete a special light-weight gossamer silk for ballooning, sometimes traveling great distances at high altitude.
- Soaring: gliding in rising or otherwise moving air that requires specific physiological and morphological adaptations that can sustain the animal aloft without flapping its wings. The rising air is due to thermals, ridge lift or other meteorological features. Under the right conditions, soaring creates a gain of altitude without expending energy. Large wingspans are needed for efficient soaring.
Flying and gliding animals - Wikipedia, the free encyclopedia
Enai de a lukal
Well-Known Member
This PERFECTLY captures the natural reaction to the OP. When one facepalm just doesn't cut it indeed.
A
angellous_evangellous
Guest
That's what thought, too.
Freelance_Policeman
Member
This.
A Cavendish experiment in space might solve things, like real quick.
Monk Of Reason
༼ つ ◕_◕ ༽つ
Someone has already answered you I bet but here it is. This isn't really a debate but I can inform you on the subject.
1. Misuse of several terms. Acceleration is the change in speed. What you meant to say was momentum. However even this is a misunderstood concept. To escape earth's gravity you would need a collosal amount of momentum. Otherwise the general laws of gravity are in effect.
2. This is a misconception. There isn't a magical line that allows us to escape earth's gravity in the way your thinking. What happens with objects such as these is they go into orbit. Orbit is where they are going so fast that their rate of speed actually matches the curvature of the earth so that they remain in constant free fall. This is also why astronauts appear to be in zero gravity. Its like falling down and having a ball in front of you fall at the same rate and from your perspective it appears to be floating.
3. Answered mostly in number 2. However there is the misconception that we are without gravity anywhere. We are being pulled by Jupiter's gravity right now. It doesn't affect us because we are so far away and the force is so weak. The sun also affects us and is what keeps our planet in orbit.
4. If gravity was the begining and end to all movement then you would be right. But we have lift, pressure, ect ect ect. All mechanics that can create counter force to do things despite gravity.