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A torque (Ï„) in physics, also called a moment (of force), is a pseudo-vector that measures the tendency of a force to rotate an object about some axis (center). The magnitude of a torque is defined as the product of a force and the length of the lever arm (radius). Just as a force is a push or a pull, a torque can be thought of as a twist.

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Wikipedia about torque

Torque%20animation.gif

A torque (Ï„) in physics, also called a moment (of force), is a pseudo-vector that measures the tendency of a force to rotate an object about some axis (center). The magnitude of a torque is defined as the product of a force and the length of the lever arm (radius). Just as a force is a push or a pull, a torque can be thought of as a twist.

The SI unit for torque is the newton meter (N m). In Imperial and U.S. customary units, it is measured in foot pounds (ft·lbf) (also known as 'pound feet') and for smaller measurement of torque: inch pounds (in·lbf) or even inch ounces (in·ozf) . The symbol for torque is τ, the Greek letter tau. .

History

The concept of torque, also called moment or couple, originated with the studies of Archimedes on levers. The rotational analogues of force, mass, and acceleration are torque, moment of inertia, and angular acceleration, respectively.

Explanation

The force applied to a lever multiplied by its distance from the lever's fulcrum, the length of the lever arm, is its torque. A force of three newtons applied two meters from the fulcrum, for example, exerts the same torque as one newton applied six meters from the fulcrum. This assumes the force is in a direction at right angles to the straight lever. The direction of the torque can be determined by using the right hand grip rule: curl the fingers of your right hand the direction of rotation and stick your thumb out so it is aligned with the axis of rotation. Your thumb points in the direction of the torque vector.

Mathematically, the torque on a particle (which has the position r in some reference frame) can be defined as the cross product:

\mathbf{\tau} = \mathbf{r} \times \mathbf{F}

where

r is the particle's position vector relative to the fulcrum
F is the force acting on the particle.

The torque on a body determines the rate of change of its angular momentum,

\mathbf{\tau}=\frac{\mathrm{d}\mathbf{L}}{\mathrm{d}t}

where

L is the angular momentum vector
t stands for time.

As can be seen from either of these relationships, torque is a vector, which points along the axis of the rotation it would tend to cause.

Proof of the equivalence of definitions

The definition of angular momentum for a single particle is:

\mathbf{L} = \mathbf{r} \times \mathbf{p}

where "×" indicates the vector cross product. The time-derivative of this is:

\frac{d\mathbf{L}}{dt} = \mathbf{r} \times \frac{d\mathbf{p}}{dt} + \frac{d\mathbf{r}}{dt} \times \mathbf{p}

Search results for Torque

What Is Torque?

Detailed definition and physics of the force.www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html

torque: Definition from Answers.com

torque n. The moment of a force; the measure of a force's tendency to produce torsion and rotation about an axis, equal to the vector product of thewww.answers.com/topic/torque

HowStuffWorks "How Force, Power, Torque and Energy Work"

You find references to force, power, torque and energy all over the HowStuffWorks site. Learn what these terms really mean and how they relate to one another.science.howstuffworks.com/fpte4.htm

Torque Game Engine - Wikipedia, the free encyclopedia

Official Torque Game Engine Product Page. The Torque Game Engine, or TGE, ... Developers who believe Torque is poor often cite the documentation as one of its ...en.wikipedia.org/wiki/Torque_Game_Engine

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GarageGames is a game development community changing the way games are ... Join the growing Torque game development community and start making games today! ...www.garagegames.com/

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AC Gearmotors have 400 lb overhung load capability.

ThomasNetFeaturing gear ratios of 19:1, 28:1 and 56:1, VWDIR40 ½ hp gearmotors with backward compatibility offer corresponding output speeds of 92, 62, and 31 rpm, and continuous torque ratings of 287, 400, and 800 in.-lb. Drop-in replacements for VW40 gearmotors have split phase, open drip-proof AC motors and integral gear reducers with all-position foot-mounting. U.L. and CSA recognized units suit ...http://news.thomasnet.com/fullstory/820937

GKN Driveline Components to Be on 2009 Mitsubishi Lancer Evolution

Business Wire via Yahoo! Finance TOCHIGI, Japan----GKN Driveline Torque Technology will supply key driveline components, including an upgraded power transfer unit , for the all-new, highly-acclaimed 2009 Mitsubishi Lancer Evolution RS.http://biz.yahoo.com/bw/081001/20081001006388.html?.v=1

Food-Safe Gripper features hygienic design.

ThomasNetDesigned for food-handling applications, GGL3060 features corrosion-resistant, stainless steel design that is sealed to IP69K standards and withstands high-pressure and high-temperature washdown cleanings. Angular design provides up to 24 lb-ft of gripping torque, and ability to swing open to 180° enables jaws to clear material below gripper. Solution meets DIN 1672-2 guidelines for hygienic ...http://news.thomasnet.com/fullstory/550047

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Kitamura Adds Mycenter HX800i Horizontal Machining Center to Line

ForbesThe HX800i has a 35HP, 12,000 rpm 2-step geared spindle delivering 280.3ft/lbs of max. torque. An optional 8,000 rpm high torque spindle has output max. torque of 699.3ft/lbs. Maximum work size of diameter 39.4 x 43.3" high with a table load ... http://www.forbes.com/businesswire/feeds/businesswire/2008/1...

2009 Volkswagen Jetta SportWagen SE

San Francisco Gate ... which drew its power from a 100-horsepower, four-cylinder in-line turbocharged direct-injection diesel "Pumpe Düse," and a 2.5 liter in-line five-cylinder motor that ran on regular unleaded petrol and produced 150 horses and 170 pound-feet of torque ... http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/10/10/...

His Cavalier keeps stalling at stop signs

Minneapolis Star TribuneA It's not the transmission staying in "high gear," it's the torque converter clutch failing to release as you slow the car to a stop. It's just like braking to a stop while still in gear in a manual transmission vehicle, and failing to push the ... http://www.startribune.com/business/30646359.html?elr=KArksL...

A convertible for many driving seasons: the 2009 Saab 9-3

San Francisco GateThe torque was tremendous, delivering 221 pound-feet of torque at just 2500 rpms. Horsepower ratings are set at 210 at 5500 rpms. The turbocharged I-4 has fuel ratings of 18/24 mpg. Part of the enjoyment is shifting through the six-speed manual ... http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/10/03/...

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Game Development Tools And Software :. GarageGames

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With eight years of development and hundreds of games under its belt, the Torque Game Engine is the engine that shook up the industry. Large commercial companies like Vivendi ... http://www.garagegames.com/products/torque/tge/
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Answers for Torque

Jay guy

What is the difference between torque over short time and torque over long period of time?

Jay guythere is no difference. Torque is work, if a transmission or Axel is rated at 600 ft lbs and you apply 1200 ft lbs it's going to fail . kind of what is the difference between lighting a dynamite fuse ...
I like horses

What's the difference between horsepower and torque?

I like horsesTorque might not be on the nameplate, but every motor has a torque spec. If the load requires more torque than the motor is capable of delivering, it will stall. A motor has a torque-speed curve, so...
Alex R

How to attach a torque wrench to an external bottom bracket?

Alex RForget the torque wrench and tighten the bolt or nut with a rachet or wrench handle one foot long. Then if you push or pull with a 20 pound force on the handle, you'll get 20 foot pounds. Many bolts a...
We Walk Alone

How much torque to use with a torque wrench?

We Walk AloneWow, you'd be better off going to the library and crack a Motors, or Chiltons big old manual and find the correct torque reading before you start. The bolts studs or nuts are so small I would think yo...
JMSA540

How much torque and horsepower do you need to do a decent burnout?

JMSA540Your burnout method really does make a difference. If you want to burn donuts on an empty asphalt parking lot, then you should be able to do it with little or no added power, but a good bit of skill....

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