Free fall

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Measured fall time of a small steel sphere falling from various heights. The data is in good agreement with the predicted fall time of <math>\sqrt{2h/g}</math>, where h is the height and g is the free-fall acceleration due to gravity.

Free fall is any motion of a body where its weight is the only force acting upon it. These conditions produce an inertial trajectory so long as gravity remains the only force. Since this definition does not specify velocity, it also applies to objects initially moving upward. Since free fall in the absence of forces other than gravity produces weightlessness or "zero-g," sometimes any condition of weightlessness due to inertial motion is referred to as free-fall. This may also apply to weightlessness produced because the body is far from a gravitating body.

• See also: Wikipedia, Commons

• Related: Weightlessness, Terminal velocity, HALO jump, g-force, Microgravity

Unplanned Freefall? Unplanned Freefall? www.greenharbor.com/fffolder/carkeet.html - Web

Free fall accidents, mathematics of free fall - de... Free fall accidents, mathematics of free fall - detailed research on the topic www.greenharbor.com/fffolder/ffresearch.html - Web

Chuteless jump survivors Chuteless jump survivors www.parachutehistory.com/other/bonusday.html - Web

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The Way Things Fall The Way Things Fall www.phy6.org/stargaze/Sfall.htm - Web

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