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Definition

Torque
In physics, torque (also called "moment") is defined as the rotational or twisting effect of a force that causes an object to rotate or turn. Torque could be thought as the rotational version of the straight line or linear force. The SI unit of torque is the Newton-meter (N·m). Torque (τ) is measured as the force (F) multiplied by the distance (d) from the axis of rotation: τ =Fd. When you spin a bicycle wheel, the force you apply to the wheel causes it to rotate which produces torque. As the wheel makes one complete revolution, the distance (d) is equal to 2π·r (i.e., the wheel's circumference), where r is the wheel's radius. In this case, the torque (τ) is calculated as: τ=F·2π·r.

Torque is an important performance measure for cars. As a car starts to accelerate, the twisting force going to each wheel as the car increases speed is torque. To achieve fast acceleration, a car's engine must produce large torque. One of the world's fastest production sport car Bugatti Veyron 16.4 Super Sport can accelerate from 0 to 100 km/h in 2.2 seconds and produce a maximum torque of 1,500 N·m. In comparison, an average passenger car can accelerate from 0 to 100 km/h in about 7 seconds and produce a maximum torque of about 300 N·m.
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Trivia  •  Fun Facts

Do you know?
What is common between turning a faucet handle and a running car engine?
They both produce torque. Torque is resulted from the turning force on an object such as a faucet handle or an engine's flywheel.