Falling ball



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Cscr-featured.svgSound-icon-empty.svgThis is a featured picture on the Romanian language Wikipedia (Imagini de calitate) and is considered one of the finest images.

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English: 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.

Français :
Un objet en chute libre depuis une position fixe parcours une distance proportionnelle au carré du temps écoulé. Cette photo a été prise sur une période de 0,5 seconde avec un flash stroboscopique réglé sur 20 impulsions par seconde. La balle, de la taille d'une balle de tennis, était retenue pas un fil noir sectionne au moment ou l'exposition a commence et ou le flash produisit sa première impulsion lumineuse.
Română: Un obiect staţionar lăsat în cădere liberă în câmpul gravitaţional al Pământului. Legea de mişcare este o funcţie de gradul al doilea, poziţia la fiecare moment fiind egală cu pătratul timpului scurs de la începutul căderii. Imaginea a fost expusă timp de 500 de milisecunde, cu un flash stroboscopic, declanşat cu o frecvenţă de 20 de flash-uri pe secundă. În primele 50 ms, mingea cade pe o unitate de distanţă (unitatea de distanţă este de aproximativ 12 mm—distanţa parcursă în 50 ms de un obiect lăsat liber în câmpul gravitaţional al Pământului de la o viteză iniţială de 0 m/s); după ce s-au scurs 100 ms, mingea a căzut 4 unităţi de distanţă; după 150 ms, mingea a parcurs 9 unităţi, şi aşa mai departe. Pentru realizarea imaginii, mingea (de dimensiunile unei mingi de tenis) a fost suspendată cu un fir negru şi a fost lăsată să cadă în momentul începerii expunerii şi odată cu primul bliţ. Aparatul a continuat să expună timp de o jumătate de secundă, timp în care bliţul s-a declanşat de mai multe ori, luminând mingea la intervale de 50 ms
Source Own work
Author MichaelMaggs

Applications-graphics.svg This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Dark background replaced with black; scale added; levels & contrast.

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Valued image

This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: Object in free fall.. You can see its nomination at Commons:Valued image candidates/Falling ball.jpg.


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EXIF data:
File name falling_ball.jpg
Size, Mbytes 0.363236328125
Mime type image/jpeg
Camera manufacturer Canon
Camera model Canon EOS 20D
Orientation of image 1
Image resolution in width direction 240
Image resolution in height direction 240
Unit of X and Y resolution 2
Exposure time 6/10 sec (0.6)
F number f / 3.2
Exposure program 1
ISO speed rating 200
Exif version 0221
Lens focal length 23 mm
Date and time original image was generated 2007:10:20 09:42:21
Date and time image was made digital data 2007:10:20 09:42:21
Shutter speed 0.736966
Aperture 3.356144
Exposure bias 0
Maximum lens aperture 2.96875
Metering mode 5
Color space information 65535
Exif image width 819
Exif image length 2751
Focal plane X resolution 2886.3636363636
Focal plane Y resolution 2885.8057630736
Focal plane resolution unit 2
Exposure mode 1
Software used Adobe Photoshop CS2 Windows

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