FRICTION. L'"'> 



CAM of A particl <-. Suppose the curve 



par- 



.0 axes of x and y exclusive of the . 

 of tin- cum-. Tho sum of tho resolved parts of A' and ) 

 along the tai is 



' X d* * l d* ' 

 The sum of the resolved parts along the norma 



. be the coefficient of friction the greatest friction capable 

 i being called into action is 



(*:' ') 



-, the condition of equilibrium will be that the 



+ Y -?- must be less than the numerical value 



</.% H 



of M (X~ ~~Y ' w *^ lout ^g* 1 ^ to ^g 11 * n cither case. 



may be con. expressed thus, 



(A S'^tbel^than.^A'g-) 



itinn in a JiiVcrcnt form, as will be 

 seen in the- following Art 



curve be of double curvnti. . I 

 .0 resultant force act exclusive 



m ti..n of the r components of P 



paral axes; /, m, n tlu- direction cosines of the tan- 



where the particle is plac- 



the angle between this tangent and the direction of P. 

 resolved pan of P along the tang< cos 0, and that at 



angles to the tangent nee, it ^ be the co- 



n, we must have for equilibrium 



