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 117
glected, if the weight W,representing one of the surfaces, is known, and also that 98 DYNAMICS. [94. of P sufficient to put W on the point of moving on theother required surface, then the constant value of theratio of these quantities is equal to the1 required co- efficient ^ = *L == ^. 94.… … V Fig. 39. The corresponding range in the values of the coeffi-cient of friction are: / a (Angle of Friction.) Bricks, stones 0.60 - 0.73 31° - 36° Wood on wood 0.10-0.47 11° - 25° Metal on metal 0.14-0.22 8° - 12£° Lubricants ,...0.05-0.11 3° - 6° Many different circumstances affect these values…
Mechanics
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