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2. Free fall - Wikipedia

   en.wikipedia.org/wiki/Free_fall

   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 common definition of the word "fall" is used, an object moving upwards is not considered to be falling, but using scientific definitions, if it ...

3. Free-fall time - Wikipedia

   en.wikipedia.org/wiki/Free-fall_time

   The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse.. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae—in which gravity plays a dominant ro

4. Equations for a falling body - Wikipedia

   en.wikipedia.org/wiki/Equations_for_a_falling_body

   Based on wind resistance, for example, the terminal velocity of a skydiver in a belly-to-earth (i.e., face down) free-fall position is about 195 km/h (122 mph or 54 m/s). [3] This velocity is the asymptotic limiting value of the acceleration process, because the effective forces on the body balance each other more and more closely as the ...

5. Slide show - Wikipedia

   en.wikipedia.org/wiki/Slide_show

   The relevant points to the entire presentation are put on slides, and accompany a spoken monologue. Slide shows have artistic uses as well, such as being used as a screensaver, or to provide dynamic imagery for a museum presentation, for example, or in installation art. David Byrne, among others, has created PowerPoint art. Slide shows have ...

6. Inertial frame of reference - Wikipedia

   en.wikipedia.org/wiki/Inertial_frame_of_reference

   For a more complex example involving observers in relative motion, consider Alfred, who is standing on the side of a road watching a car drive past him from left to right. In his frame of reference, Alfred defines the spot where he is standing as the origin, the road as the x-axis, and the direction in front of him as the positive y-axis.

7. Free fall machine - Wikipedia

   en.wikipedia.org/wiki/Free_fall_machine

   The free fall machine (FFM) addresses some of the problems of the simple horizontal clinostat or random positioning machines (RPM).In a typical machine samples are allowed to cycle between free fall for about a metre down a column (micro-gravity simulation, near "0 g") and a "bounce" back to the top of the column that is intended to be so fast (c. 20 g for 20 ms) that it is undetected by the ...