. Contributions. esurfaces are rough. This is an interesting thingas we ordinarily think of the force of friction as aforce which prevents, or tends to prevent, it plays the opposite xol^J^The illustrationsalso suggest the general question to what conditions must be satis-fied in order that motion may be possible when the velocity is normalto the con straining force, or perhapsit would be better to say: under whatcircumstances does the suppositionthat motion takes place lead to con-ditions which are compatible? I pro-pose to treat a fairly general typeof problem of this kind, v
. Contributions. esurfaces are rough. This is an interesting thingas we ordinarily think of the force of friction as aforce which prevents, or tends to prevent, it plays the opposite xol^J^The illustrationsalso suggest the general question to what conditions must be satis-fied in order that motion may be possible when the velocity is normalto the con straining force, or perhapsit would be better to say: under whatcircumstances does the suppositionthat motion takes place lead to con-ditions which are compatible? I pro-pose to treat a fairly general typeof problem of this kind, viz.: giventico parallel plane curves c and t\,the distance between the two being a(Fig. 5); two particles of mass mand niy, connected by a ivdghtles rodof length a, are constrained to movealong c andc^. No external forces act y-on the particles. Under uhaf circum-stances does the supposition that motion takes place lead to conditions uhirhare compatible: (a) when c and f, are smooth, (b) irhen c and c^ an- rough?. Fig.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcontribution, bookyear1915
