The outlines of physics: an elementary text-book . hich the free end of therod is turned: then 6 : F, where F is the torsional force; 6:1, where I is the length of the twisted rod; ^:—, where r is the radius of the twisted rod. In the case of torsional forces, it is really Avith the momentof the force (or the torque) that we have to do. 106 THE OUTLINES OF PHYSICS It can be shown ^ that the laws of torsion are fully ex-pressed by means of an eiquation T=n- 21 in which T is the torque (or moment of the twisting force),and w is a constant called the constant of torsion, whichdepends upon, and in
The outlines of physics: an elementary text-book . hich the free end of therod is turned: then 6 : F, where F is the torsional force; 6:1, where I is the length of the twisted rod; ^:—, where r is the radius of the twisted rod. In the case of torsional forces, it is really Avith the momentof the force (or the torque) that we have to do. 106 THE OUTLINES OF PHYSICS It can be shown ^ that the laws of torsion are fully ex-pressed by means of an eiquation T=n- 21 in which T is the torque (or moment of the twisting force),and w is a constant called the constant of torsion, whichdepends upon, and indicates the ^^^r of the material toresist torsion. ^^^B The relations between T, d,^KKri are easily demon-strated by means of the following experiment: 95. Experiment 22. Torsion of a Rod. — It is the object of thisexperiment to verify the fact that the angle through which a rod orwire, one end of which is fixed, will be twisted by a torsional forceapplied at the free end is proportional to the length of the rod and to themoment of the Fig. : .(1) A straight brass rod rather more than 100 cm. long and about cm. in diameter. This must be rigidly fastened to a block at one end; 10 cm. from the other end a wheel is mounted. (See Fig. 83.) 1 See Elements of Physics, p. 102.
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