Abstract
This chapter discusses some special problems involving friction. The chapter reviews belt and rope friction. If a belt is to transmit a torque to a pulley, it is clear that the tensions must be different on the two ends of the belt as it encounters and leaves the pulley face. The difference in tension is caused by the friction between the belt and the pulley face. The chapter describes power transmission by belts. Belts cannot be used where any high degree of precision of velocity ratio is desired, even when underloaded slipping must occur on account of the extension and contraction of the belt as it passes from the taut to the slack side. Continuity of mass demands that the mass per second of belt that passes a given point on the slack side of a belt must be the same as the mass that passes a point on the taut side.
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