Torque
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Torque applied via an adjustable end wrench
Relationship between force, torque, and momentum vectors in a rotating system
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[change] Definition
The most basic definition of torque in physics is a turning or twisting force. If a force is used to begin to spin an object, or to stop an object from spinning, a torque is made.
The force applied to a lever, multiplied by the distance from the lever's fulcrum is described as torque.
[change] Fulcrum
Fulcrum is the axis of rotation or point of support on which a lever turns in raising or moving something.
[change] Equation
The equation for torque is:
τ = r x F
where, F is the force vector, and r is the vector from the axis of rotation to the point where the force is acting.
Note: The SI unit of torque is the newton-metre. The most common English unit is the foot-pound.
[change] Key
Scalar - quantities with magnitudes. Vector - quantities with magnitudes and direction.
[change] Other websites
- "Horsepower and Torque" An article showing how power, torque, and gearing affect a vehicle's performance.
- a discussion of torque and angular momentum in an online textbook
- Torque and Angular Momentum in Circular Motion on Project PHYSNET.
- An interactive simulation of torque
