free fall


free fall

In mechanics, the state of a body that moves freely in any manner in the presence of gravity. The planets are in free fall in the gravitational field of the Sun. A body in free fall follows an orbit such that the sum of gravitational and inertial forces equals zero. See also gravitation; Newton's laws of motion.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on free fall, visit Britannica.com.

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