What is free fall?
In Newtonian physics, a freely falling object moves only under the influence of the force of gravity.
In Einsteinian physics, there is no force of gravity, and a freely falling body has no force acting on it.
According to this view, freely falling objects follow geodesic curves through spacetime.
In both Newtonian and Einsteinian physics, freely falling bodies experience weightlessness.
Want to learn more?
How come we feel weightless in free fall? How can "gravity go away" in free fall? Watch Brian Greene discuss the physics of free fall and gravity at the World Science Festival.
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