Free fall
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In classical mechanics, free fall is any motion of a body where gravity is the only force acting upon it. A freely falling object may not necessarily be falling down in the vertical direction. If the
Acceleration of a small meteoroid when entering the Earth's atmosphere 80 km high (above which the Kennelly–Heaviside layer) at different initial velocities of 35, 25 and 15 km/s. Air pressure and air density are height-dependent.
Drop time
Equations for a falling body
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A set of equations describing the trajectories of objects subject to a constant gravitational force under normal Earth-bound conditions. Assuming constant acceleration g due to Earth's gravity, Newton
Free fall
…Dynamical time scale Equations for a falling body Free-fall time…
An initially stationary object which is allowed to fall freely under gravity falls a distance proportional to the square of the elapsed time. This image, spanning half a second, was captured with a stroboscopic flash at 20 flashes per second. During the first 0.05 s the ball drops one unit of distance (about 12 mm), by 0.10 s it has dropped at total of 4 units, by 0.15 s 9 units, and so on.