Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 88
F D a Multiplying equations 4 and 5, the mechanical advantageof the system is found to be (6) - F al In every actual machine some of the energy is expendedin work done against friction or other prejudicial resistances. … The ratio of the work done by the machine to the work doneupon it is called the efficiency. 52. Friction. — The resistance which bodies oppose tothe movement of one surface on another is termed friction.It depends both on the nature and the roughness of the 78 WORK AND ENERGY. surfaces in contact.…
Physics
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