This is a featured picture on Wikimedia Commons ( Featured pictures ) and is considered one of the finest images. See its nomination here . Wikipedia This is a featured picture on the Arabic language Wikipedia ( صور مختارة ) and is considered one of the finest images. See its nomination here . This is a featured picture on the German language Wikipedia ( Exzellente Bilder ) and is considered one of the finest images. See its nomination here . This is a featured picture on the English language Wikipedia ( Featured pictures ) and is considered one of the finest images. See its nomination here . This is a featured picture on the Persian language Wikipedia ( نگاره‌های برگزیده ) and is considered one of the finest images. See its nomination here . This is a featured picture on the Turkish language Wikipedia ( Seçkin resimler ) and is considered one of the finest images. See its nomination here . This is a featured picture on the Chinese language Wikipedia ( 特色图片 ) and is considered one of the finest images. See its nomination here . 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 .

This image was selected as picture of the day on Wikimedia Commons for 24 March 2008 . It was captioned as follows: English: Pulley diagram with 4 pulleys Other languages: Afrikaans : Katrolhefbome skematies voorgestel in vier konfigurasies Asturianu : Un diagrama amosando cuatro menes d'aperiar les polees. D'izquierda a drecha, amuésase que la fuercia pa allevantar la mesma masa, amenorga según s'amesten más polees. Bosanski : Dijagram sa četiri kotura. Čeština : Schematické znázornění rozložení sil na jednoduchém stroji - kladce . Dansk : Diagram over fire forskellige taljer . Deutsch : Diagramm verschiedener Flaschenzüge English : Pulley diagram with 4 pulleys Español : Un diagrama mostrando cuatro tipos de poleas . De izquierda a derecha, para una misma masa (peso) la fuerza ejercida para levantarla disminuye. Euskara : Poleen diagrama. Français : Schémas comparatifs d'une poulie simple et de palans à 2, 3 et 4 brins. Hrvatski : Dijagram kolotura s četiri kolotura. Íslenska : Skýringarmynd sem sýnir talíu með allt að fjórum trissum . Italiano : Diagramma con carrucole multiple. Magyar : Csigasor diagram 4 csigával Nederlands : Katroldiagram met vier katrollen Polski : Diagram z czterema wielokrążkami . Português : Um diagrama mostrando quatro tipos de arranjos de polias . Sendo que da esquerda para a direita para uma mesma massa (peso) a força exercida para ergue-la diminiu. Suomi : Kaaviokuva neljästä taljasta Svenska : Illustration av hur block och taljor fungerar. Беларуская : Схема працы блокаў і паліспастаў. मराठी : कपी पध्दत रेखाचित्र चार कपी दर्शवीत. 한국어 : 4개의 도르래 가 있는 그림. 日本語 ： 4つの 滑車 図形 中文 ： 四滑轮图解 中文（繁體） ： 四 滑輪 圖解 العربية : مخطّط بكرة بـ 4 بكرات

Summary

Description Four pulleys.svg	العربية: أربع أمثلة مختلفة لأنظمة الحبل والبكرة. English: Pulley diagram with 4 pulleys. Suomi: Kaaviokuva neljästä taljasta . 中文： 四滑轮图解。这是一个理想状态。实际上每增加一个滑轮都会增加滑轮组自重，同时也带来更大的摩擦阻力。 Nederlands: Katroldiagram met vier katrollen Español: Diagrama de 4 poleas . Deutsch: Flaschenzugdiagramm mit vier Flaschenzügen.
Date	2 September 2006
Source	Own work
Author	Prolineserver , Tomia (minor edits by Stanisław Skowron , scale adjusted by Atropos235 )
Other versions	Derivative works of this file: Four pulleys FH.svg Pulleys.svg , Three pulleys.svg
SVG development InfoField	The SVG code is valid . This diagram was created with Inkscape …important . This diagram uses embedded text that can be easily translated using a text editor.

Summary

• F _Z = Rope tension or effort force
• F _L = Load or resistance force
• s = Rope displacement (distance pulled) or effort distance
• h = Height (distance load is raised) or resistance distance

An illustration showing how pulleys are used to obtain a mechanical advantage . Using additional pulleys decreases the force required but increases the distance required to raise a load the same amount. In each instance here the mechanical work done is the same, work being the product of force and distance.

• F _Z × s = F _L × h
  • 10 cm × 100 N = 10 J
  • 20 cm × 50 N = 10 J
  • 30 cm × 33 1/3 N = 10 J
  • 40 cm × 25 N = 10 J

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