A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 112
o given surfaces in contact. It is supposed thatno abrasion of these surfaces takes place. (1) The force of friction is proportional to the normalpressure of the surfaces in contact. (2) Friction is independent of the extent of surfacein contact when the normal pressure remains the same. (3)… … Fig. 34. Fig. 33. body if it rests upon a horizontal plane. Hence (Fig. 33) R = W. (b) If the body rests upon an inclined plane, thenormal pressure is equal to that portion or component ofthe weight which is perpendicular to the surface. Thatis (Fig. 34), R z=z W cos a. For if (Fig. 34) ac…
Mechanics
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