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Sentosahere
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Normally in a free fall , there will be gravity acting to your body but when we free fall , we don't really feel the force , we feel weightless ( ignoring air resistance ) , ( not in contact with anything). Why?
in free fall, there are essentially no stresses or strains acting, so we don't feel anything even though the gravity force (weight force) is always acting. When standing on the ground, we feel the normal force ( contact force) causing internal stresses on the body. Remove that contact force and the stresses go away, and the body must now adjust to the lack of stress which make you 'feel' queasy like on a roller coaster drop . In that sense, we sort of do feel gravity, at least during the period of adjustment (which astronauts adjust to I am told, I am not one).Sentosahere said:Normally in a free fall , there will be gravity acting to your body but when we free fall , we don't really feel the force , we feel weightless ( ignoring air resistance ) , ( not in contact with anything). Why?
Weightlessness in free fall, also known as microgravity, is a state where an object is experiencing zero or very little apparent gravitational force. This is due to the object being in a constant state of free fall towards a larger body, such as the Earth, where the gravitational force is canceled out by the object's inertia.
Weightlessness in free fall can affect the human body in various ways. The absence of gravity can cause a decrease in bone density, muscle atrophy, and changes in the cardiovascular system. It can also cause a feeling of disorientation and motion sickness in some individuals.
Objects in free fall appear to float because they are in a state of weightlessness, where the gravitational force is canceled out by the object's inertia. This creates the illusion of the object floating as it falls towards a larger body.
Astronauts experience weightlessness in space because they are in a constant state of free fall towards the Earth. This is due to the spacecraft and the astronauts inside it orbiting the Earth, which creates a balance between the gravitational pull and the centrifugal force of the orbit. As a result, the astronauts feel weightless inside the spacecraft.
Yes, weightlessness in free fall can be simulated on Earth through parabolic flight maneuvers. These maneuvers involve flying a plane in a parabolic path, which creates a temporary state of free fall for the passengers inside the plane. This allows scientists and researchers to study the effects of weightlessness on the human body and conduct experiments in a simulated microgravity environment.