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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 도르래가 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

DescriptionFour 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.

• 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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