What is the Meaning of Torque ???

Guys!!!!


Can somebody please explain me the explain me the meaning of Torque which is generally spoken in Context of Automobiles.

In terms of Physics :

Torque, moment or moment of force (see the terminology below), is the tendency of a force to rotate an object about an axis,[1] fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist.

Loosely speaking, torque is a measure of the turning force on an object such as a bolt or a flywheel. For example, pushing or pulling the handle of a wrench connected to a nut or bolt produces a torque (turning force) that loosens or tightens the nut or bolt.

The symbol for torque is typically τ, the Greek letter tau. When it is called moment, it is commonly denoted M.

The magnitude of torque depends on three quantities: the force applied, the length of the lever arm[2] connecting the axis to the point of force application, and the angle between the force vector and the lever arm. In symbols:

\boldsymbol \tau = \mathbf{r}\times \mathbf{F}\,\!

\tau = rF\sin \theta\,\!

where

τ is the torque vector and τ is the magnitude of the torque,
r is the displacement vector (a vector from the point from which torque is measured to the point where force is applied), and r is the length (or magnitude) of the lever arm vector,
F is the force vector, and F is the magnitude of the force,
× denotes the cross product,
θ is the angle between the force vector and the lever arm vector.

The length of the lever arm is particularly important; choosing this length appropriately lies behind the operation of levers, pulleys, gears, and most other simple machines involving a mechanical advantage.

In terms of a vehicle :

Torque is part of the basic specification of an engine: the power output of an engine is expressed as its torque multiplied by its rotational speed of the axis. Internal-combustion engines produce useful torque only over a limited range of rotational speeds (typically from around 1,000–6,000 rpm for a small car). The varying torque output over that range can be measured with a dynamometer, and shown as a torque curve. The peak of that torque curve occurs somewhat below the overall power peak. The torque peak cannot, by definition, appear at higher rpm than the power peak.

Understanding the relationship between torque, power and engine speed is vital in automotive engineering, concerned as it is with transmitting power from the engine through the drive train to the wheels. Power is a function of torque and engine speed. The gearing of the drive train must be chosen appropriately to make the most of the motor's torque characteristics. Power at the drive wheels is equal to engine power less mechanical losses regardless of any gearing between the engine and drive wheels.

Steam engines and electric motors tend to produce maximum torque close to zero rpm, with the torque diminishing as rotational speed rises (due to increasing friction and other constraints). Reciprocating steam engines can start heavy loads from zero RPM without a clutch.

Hi natasha, I just want to ask u that wat's the need to give a such long clarification for a simple word which related to science. you can also explain it in simple language or in short method.....nd ravinder hope you understand that wat's the actual meaning of torque and if not then let me explain you it in simple or short definition. "Torque is a measure of the turning force on an object such as a bolt or a flywheel. For example, pushing or pulling the handle of a wrench connected to a nut or bolt produces a torque (turning force) that loosens or tightens the nut or bolt. The symbol for torque is typically τ, the Greek letter tau. When it is called moment, it is commonly denoted M."

Hi siddharth Awasthi
See in the simple language torque is movement on the axis or a term which define the how much faster a rotation can take place at the axis. Torque is the application of force where there is rotational motion.

Guys in simple language it defines turning capacity of the car, isn't it.

Torque is a rotational force. It is measured in units of force multiplied by a unit of distance. For example, a foot pound is one pound of force at a distance of one foot. It can give you an indication of how strong an engine is (500 ft-lbs is a LOT of torque) or how tight you need to have a bolt. The lug nuts on your wheels need to be about 100 ft-lbs, the bolts on your suspension twice that or more.

In cars you'll see torque measured in foot pounds (ft-lbs) or Newton meters (Nm). This is not to be confused with Power which is measured in horsepower or kiloWatts (at least in cars). Power is how fast you can turn something.

I only wanted to make things easy.. and well explained. I have only used some internet search and added few things.

HI
Loosely speaking, torque is a measure of the turning force on an object such as a bolt or a flywheel. For example, pushing or pulling the handle of a wrench connected to a nut or bolt produces a torque (turning force) that loosens or tightens the nut or bolt.

Hi Sanjeev 449

Thank you for the well needed Explaination