In classical mechanics, a torsion coefficient is a property of torsion springs. It is the torque required to twist a body through an angle of one radian, and is usually denoted by K. Therefore it is given as In physics, classical mechanics or Newtonian mechanics is one of the two major sub-fields of study in the science of mechanics, which is concerned with the set of physical laws governing and mathematically describing the motions of bodies and aggregates of bodies. ... A torsion spring is a ribbon, bar, or coil that reacts against twisting motion. ... In physics, torque can be thought of informally as rotational force. Torque is measured in units of newton metres, and its symbol is Ï„. The concept of Torque, also called moment or couple, originated with the work of Archimedes on levers. ... See Radian (band) for the Austrian trio. ...

where τ is the torque and θ is the angle in radians. This equation is analogous to the spring constant given by Hooke's law, only used for rotational motion, instead of linear motion. In physics, Hookes law of elasticity is an approximation which states that if a spring is elongated by some distance, x, the restoring force exherted by the spring, F, is proportional to x by a constant factor, k. ... See also rotation around a fixed axis. ...

References

• Wolfson, Richard, Jay M. Pasachoff (1999). Physics for Scientists and Engineers, 3rd ed., 371, Reading, Massachusetts: Addison-Wesley. ISBN 0-321-03571-2.