Falling ball

Forfatter/Opretter:

MichaelMaggs

Attribution:

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Kredit:

Eget arbejde

Shortlink:

https://dkwiki.dk/b/13cc3

kilde:

Wikimedia Commons

størrelse:

819 x 2751 Pixel (371954 Bytes)

beskrivelse:

An initially-stationary object which is allowed to fall freely under gravity drops a distance which is 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 1/20th of a second the ball drops one unit of distance (here, a unit is about 12 mm); by 2/20ths it has dropped at total of 4 units; by 3/20ths, 9 units and so on.
To take the picture, the ball - about the size of a tennis ball - was suspended by a short length of black thread and was released as the shutter was opened and the flash triggered. The shutter remained open for the whole of the half-second period, during which time the flash fired multiple times to capture the ball at 1/20 second intervals.

Licens:

CC BY-SA 3.0

Licensbetingelser:

Creative Commons Attribution-Share Alike 3.0