the mechanical advantage of a tackle is 4-to-1

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• Mechanical advantage — is a measure of the force amplification achieved by using a tool, mechanical device or machine system. Ideally, the device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output… …   Wikipedia

• Mechanical advantage device — Beam balanced around a fulcrum A simple machine that exhibit mechanical advantage is called a mechanical advantage device e.g.: Lever: The beam shown is in static equilibrium around the fulcrum. This is due to the moment created by vector force A …   Wikipedia

• Block and tackle — A block and tackle [ Tackle can be pronEng|ˈteɪkəl in this usage.] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift or pull heavy loads. TOC Overview Although used in many situations, they are… …   Wikipedia

• tackle — I (New American Roget s College Thesaurus) n. pulley; gear, equipment, apparatus, instruments; luggage. v. t. grasp, grapple with; seize; address, attach; attempt, try, undertake. See undertaking, provision. II (Roget s IV) n. 1. [Equipment] Syn …   English dictionary for students

• block and tackle — the ropes or chains and blocks used in a hoisting tackle. [1830 40] * * * Combination of pulleys with a rope or cable, commonly used to augment pulling force. Two or more of the pulleys are attached to a fixed block, and the remaining pulleys are …   Universalium

• tackle — I. noun Etymology: Middle English takel; akin to Middle Dutch takel ship s rigging Date: 13th century 1. a set of the equipment used in a particular activity ; gear < fishing tackle > 2. a. a ship s rigging b. an assemblage of ropes and pulleys… …   New Collegiate Dictionary

• History of the world — The history of the world [Williams, H. S. (1904). The historians history of the world; a comprehensive narrative of the rise and development of nations as recorded by over two thousand of the great writers of all ages. New York: The Outlook… …   Wikipedia

• luff tackle — noun Etymology: luff (I) : a tackle that has a single and a double block with the standing part of the fall fixed to the single block thus multiplying the power three or four times according as the single or the double block is movable see tackle …   Useful english dictionary

• gun tackle — noun : a block and tackle arrangement formerly used for running a gun carriage to and from a gun part or raising or lowering a gun see guntackle purchase; tackle illustration * * * Naut. a tackle composed of a fall rove through two single blocks… …   Useful english dictionary

• luff tackle — Naut. a tackle having a double block and a single block, giving a mechanical advantage of three or four, neglecting friction, depending on which is the standing and which is the running block. See diag. under tackle. [1690 1700] * * * …   Universalium

• gun tackle — Naut. a tackle composed of a fall rove through two single blocks and secured to one of them so as to secure a mechanical advantage of two or three, neglecting friction, depending on the arrangement. See diag. under tackle. [1785 95] * * * …   Universalium