Image:Bouncing ball strobe edit.jpg
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This image was selected as picture of the day on the English Wikipedia for February 22, 2008. |
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This file was a candidate on Picture of the Year 2007. This is a featured picture on Wikimedia Commons: it is considered one of our finest images. With an aspect ratio of 8:5, 16:10, or 16:9 this image is suitable as a widescreen computer wallpaper. This is a featured picture on English Wikipedia and is considered one of the finest images. If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it. |
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This image was selected as a picture of the day for December 06, 2007. It was captioned as followed: English: A bouncing ball captured with a stroboscopic flash at 25 images per second.
Asturianu: Imaxen estroboscópica (25 flash/sec) d'una bola rebotando.
Беларуская: Адскокі шара ў страбаскапічным святле частатой 25 Гц.
Česky: Snímek skákajícího míče pořízený při osvětlení stroboskopem s frekvencí 25 záblesků za sekundu.
Dansk: En studsende bold fotograferet med stroboskopisk blist, 25 billeder pr. sekund.
Deutsch: Ein hüpfender Ball aufgenommen mit einem Stroboskop-Blitz bei 25 Bildern pro Sekunde.
English: A bouncing ball captured with a stroboscopic flash at 25 images per second.
Español: Una bola que despide capturada con un flash stroboscopic en 25 imágenes por segundo.
Suomi: Pomppivasta pallosta otettu kuva stroboskooppisalamalla 25:lla kuvalla sekunnissa.
Français : Image stroboscopique (25 flash/sec) d'une balle rebondissant sur un sol dur.
Magyar: Pattogó labda stroboszkópos felvétele (másodpercenként 25 kép)
Íslenska: Ljósmynd af bolta tekin með blikleiftri.
Italiano: Fotografia stroboscopica del rimbalzo di una palla.
日本語: 毎秒25回発光の ストロボスコープで撮影した弾むボール
Nederlands: Een stuiterende bal gefotografeerd met een stroboscopische flits met 25 flitsen per seconde
Polski: Zdjęcie odbijającej się piłki zrobione z wykorzystaniem stroboskopu o częstotliwości 25 błysków na sekundę.
Português: Fotografia estroboscópica de uma bola descrevendo uma parábola.
Русский: Стробоскопическое изображение отскакивающего мяча, снятое с частотой 25 кадров в секунду.
Basa Sunda: Bal nu ngancul dirékam ku kaméra stroboskopik nu bisa moto 25 gambar per detik.
Svenska: En studsande boll fotograferad med stroboskopisk blixt, 25 bilder per sekund.
Українська: Стробоскопичне зображення стрибаючого м'яча, зняте з частотою 25 кадрів у секунду.
中文(简体): 每秒25次拍摄的跳跃的 球
中文(繁體): 由頻閃觀測儀每秒25次拍攝跳躍的球所形成的 拋物線軌跡
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| Description |
English: A bouncing ball captured with a stroboscopic flash at 25 images per second. Note that the ball becomes significantly non-spherical after each bounce, especially after the first. That, along with spin and air-resistance, causes the curve swept out to deviate slightly from the expected perfect parabola. Spin also causes the angle of first bounce to be shallower than expected. As a ball falls freely under the influence of gravity, it accelerates downward, its initial potential energy converting into kinetic energy. On impact with a hard surface the ball deforms, converting the kinetic energy into elastic potential energy. As the ball springs back, the energy converts back firstly to kinetic energy and then as the ball re-gains height into potential energy. Energy losses due to inelastic deformation and air resistance cause each successive bounce to be lower than the last.
The image is of a child's ball about the size of a tennis ball. Español: La imagen de una pelota rebotando fue capturada con un flash estroboscópico a 25 cuadros por segundo. Se aprecia que la pelota cambia significativamente de forma después de cada bote, especialmente luego del primero. Eso, junto a la rotación y la resistencia del aire, hace que el trayecto se desvíe ligeramente de la perfecta parábola que debería seguir. La rotación también causa que el ángulo en el primer rebote sea más profundo que lo esperado. Mientras la pelota cae libremente gracias a la fuerza de gravedad, se acelera su descenso y la energía inicial se convierte en energía potencial cinética. Al impactar superficies duras, la pelota se deforma, conviertiendo la energía cinética en energía potencial elástica. Cuando la pelota salta nuevamente, la energía se convierte otra vez en energía cinética y luego, mientras la pelota vuelve a ganar altura, la energía pasa a ser potencial. La energía se pierde debido a que la deformación inelástica y la resistencia al aire hacen que cada bote sea más bajo que el anterior.
En la fotografía se muestra una pelota cuyo tamaño es similar al de una pelota de tenis. Français : Image stromboscopique (25 flash/sec) d'un ballon rebondissant sur un sol dur. La balle perd significativement sa forme sphérique après chaque rebondissement, tout particulièrement après le premier. Ce fait, ainsi que sa rotation et la résistance de l'air, explique pourquoi la trajectoire parcourue s'écarte légèrement de la parabole parfaite prévue par la théorie. Cela explique aussi pourquoi l'angle décrit lors du premier rebond est moins fermé que prévu. Lors d'une chute libre sous l'influence de la gravité, la balle accélère, convertissant son énergie potentielle en énergie cinétique. Lors de l'impact, cette énergie est convertie en énergie potentielle élastique, qui est elle même reconvertie en énergie cinétique lors du rebond, puis en énergie potentielle au fur et à mesure que la balle s'élève à nouveau. Les pertes d'énergies dues aux déformations plastiques de la balle et au frottement avec l'air font que la balle rebondit de moins en moins haut. La balle représentée ici a la taille d'une balle de tennis.
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| Source |
Own photo |
| Date |
29 September 2007 |
| Author |
Self: Commons user MichaelMaggs Edit by Richard Bartz |
| Permission ( Reusing this image) |
see below
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Dark background replaced with black, crop, level, increase saturation and contrast. |
Licensing
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 17:27, 8 October 2007 | 1,800×1,159 (293 KB) | Richard Bartz | ({{Information |Description=A bouncing ball captured with a stroboscopic flash at 25 images per second. Note that the ball becomes significantly non-spherical after each bounce, especially after the first. That, along with spin and air-resistance, causes ) |
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Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
| Camera manufacturer | Canon |
|---|---|
| Camera model | Canon EOS 20D |
| Exposure time | 8/5 sec (1.6) |
| F-number | f/4.5 |
| Date and time of data generation | 18:25, 29 September 2007 |
| Lens focal length | 18 mm |
| Orientation | Normal |
| Horizontal resolution | 350 dpi |
| Vertical resolution | 350 dpi |
| Software used | Adobe Photoshop CS Windows |
| File change date and time | 19:25, 8 October 2007 |
| Exposure Program | Manual |
| ISO speed rating | 200 |
| Exif version | 2.21 |
| Date and time of digitizing | 18:25, 29 September 2007 |
| Aperture | 4.33984375 |
| Exposure bias | 0 |
| Flash | 9 |
| Colour space | sRGB |
| Focal plane X resolution | 2886.36363636 |
| Focal plane Y resolution | 2885.80576307 |
| Focal plane resolution unit | inches |
| Custom image processing | Normal process |
| Exposure mode | Manual exposure |
| White balance | Auto white balance |
| Scene capture type | Standard |
Categories: Wikipedia featured pictures