. The Family tutor . Fig. 181. Fig. 182. nut forces the CHAPTER XXX. OF PASSIVE OR RESISTING FORCES. Difference between the Theoretical and Actual Results of Machinery.—Of Impediments toMotion.—Friction.—Sliding and Rolling Friction.—Co-efficient of Friction.—Action ofUnguents.— Resistance of Media.— General Phenomena of Resistance.— Rigidity ofCordage. It has already been stated, in the foregoing Chapters, that the properties ofmachinery are described without taking into account any of those resisting agencieswhich so greatly complicate their action. The results of the theory of a machine int
. The Family tutor . Fig. 181. Fig. 182. nut forces the CHAPTER XXX. OF PASSIVE OR RESISTING FORCES. Difference between the Theoretical and Actual Results of Machinery.—Of Impediments toMotion.—Friction.—Sliding and Rolling Friction.—Co-efficient of Friction.—Action ofUnguents.— Resistance of Media.— General Phenomena of Resistance.— Rigidity ofCordage. It has already been stated, in the foregoing Chapters, that the properties ofmachinery are described without taking into account any of those resisting agencieswhich so greatly complicate their action. The results of the theory of a machine inthis respect differ very widely from its practical operation. There are resisting forces VOL. V.—NO. LX. 2 A 332 NATURAL PHILOSOPHY. or impeding agencies which have thus far been kept out of view. We have describedlevers as being inflexible, the cords of pulleys as perfectly pliable, and machinerv-,generally, as experiencing no friction. In the case of one of the powers, it is truethat this latter re
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