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Thread: 'G' force

  1. #1 'G' force 
    Forum Freshman
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    if you traveled in a plane you would have felt some amount of 'G' force on your body. But why arent we feeling it when EARTH is revolving around SUN at greater velocity :wink:


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  3. #2  
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    We just evolved that way. Plus, the Earth is moving incredibly slowly for its size, so you just don't notice, the same way a person taking one footstep per hour doesn't appear to be moving.


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  4. #3  
    Forum Radioactive Isotope mitchellmckain's Avatar
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    This so called "G force" is due to the inertia of your body so that you try to continue going in the same direction at the same velocity when the plane turns, accelerates or decelerates so that it is gong in a different direction at a different velocity.

    In a plane moving at a constant velocity its engines apply enough force to balance the force of air resistance and get enough lift force from the wings to balance the gravitational force. Since it fights the gravitational force and this force acts on you inside the plane as well then you are affected by gravity much the same as you would on the ground.

    A space station in orbit needs practically no forces to maintain orbit. You and the station are falling freely under the action of the gravity from the earth. However its forward velocity means that its falling only causes it to move in a circle around the earth. Even though the station is moving faster than a plane, you feel no forces at all not even gravity. You and the station are moving in exactly the same way for the same reasons so there are no "G forces".

    Well the earth is also in freefall, since it is in orbit around the sun. It and everything on it is falling into the sun under the action of the gravity from the sun, but its orbital velocity means that this falling only makes it move in a circle around the sun. So there are no "G forces" from this motion around the sun.

    Also the gravitational force of the sun at the distance of earth's orbit is not that strong. Even without earth's forward velocity it would take about a month and a half before the earth falls halfway toward the sun.
    See my physics of spaceflight simulator at http://www.relspace.astahost.com

    I now have a blog too: http://astahost.blogspot.com/
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