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Weightlessness

Weightlessness

When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...

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Related Experiment Video

Updated: Jan 30, 2026

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Published on: May 23, 2011

Man in Weightlessness

¹R.A.F. Consultant in Aviation Medicine, R.A.F. Institute of Aviation Medicine, Farnborough, Hampshire.

Journal of the Royal College of Physicians of London

|January 23, 2019

Summary

No abstract available in PubMed .

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