Gravity is proportional to the mass and inversely proportional to the square of the distance of the centre of the body or bodies.
As the shuttle orbits at a comparatively low altitude and the mass remains constant the force diminishes only slightly. Being in free-fall does not mean there is no gravity.
Gravity falls off with the square of the distance so the force will be less at 19200 kilometers as compared to on the Earth's surface.
Gravity and Inertia
An astronaut can never be in zero gravity in our solar system, because there is gravity (usually) from the Earth, and always from the Sun. It is important to distinguish weightlessness from zero gravity. Weightlessness occurs in a gravity environment in which the person is freefalling, hopefully in orbit. In a freefall condition, there is no friction to retard your fall, so you feel nothing pressing against you, and thus you feel weightless..When in orbit around the Earth, an astronaut is in freefall, and is therefore weightless, but there is still gravity. When travelling between the Earth to the Moon, the astronaut is still in orbit around the Sun, and is therefore freefalling weightlessly.
First of all the low gravity decreases all the muscle tone inside the astronaut. They find themselves unable to keep their food down in zero gravity. Then their is time. Time goes faster for them as they are away from the earth. It is because they are away from a earth a heavy body. Im not going to explain this in details as the answer is not for this question.
Mostly gravity.
The force of gravity that they exert on each other, and the velocities of the Moon and Earth which is their "inertia".
Weightlessness.
Gravity
If the size of the space station is large enough, then the astronaut will detect the change in Earth's gravity (g).
One example is how light an astronaut weighed when standing on the moon. As there is very little gravity on the moon, the astronaut was able to jump much higher than he could back on earth.
Gravity, mainly that of the moon. Gravity on the Moon is a lot less than on Earth but it works in the same way.
There is always gravity between two objects. If the astronaut is in a stable orbit around an object, he/she will not sense any gravity. If he/she is standing on the object, such as the Moon, there will be a sense of gravity. In the case of the moon, its gravity is about one sixth that of Earth. Also, if the spacecraft is accelerating, the the reaction force of the engine will cause the sense of gravity as well.There is also gravity between the astronaut and the spaceship, but that is so small that it will generally not be noticed.
It actually means that the astronaut is in free fall, and doesn't FEEL gravity. Gravity does affect the astronaut, so the astronaut will still be accelerated towards Earth. However, the astronaut won't feel the gravity.
This means that during space flight the astronaut is feeling a force which is 5 times that of gravity, therefore the astronaut is being pulled five times as much as he is standing on the planet
The force of gravity.
Gravity from objects such as the Earth, the Moon, the Sun, or the Milky Way will attract and accelerate an astronaut. "Accelerate" implies that the astronaut's velocity will change over time.If the astronaut is in free fall (basically, the spaceship's engine is not pushing the spacecraft), then the astronaut won't FEEL such gravity.
Gravity
No, unless they are near a body with enough mass to have gravitational pull. For example, standing on the moon they would feel gravity (although it's a lot less than Earth's gravity ) but floating in space technically there is still gravity but it is such a small force that an astronaut would not feel it.