supposed the string to be all in one plane—^the demonstration might without much trouble be extended to shew that the tension is the same at every point in whatever manner the string passes freely along a smooth surface or tube of any form. 66. A string passes in one plane over a rough curve… … Let P, Q be the tensions at the points where the string quitsthe curve—and supposeit to be on the point ofmotion in the directionin which P acts—thenthe friction at every pointof the arc will act tan-gentially in the oppositedirection. Let ps be any finitelength of the string, the normals at p, s…
Mechanics
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