. The railroad and engineering journal . revolution .5 is turned only iSo degrees. The amount of this turn-ing, expressed in degrees or angular units, is called the aii^iihtrvelocity. Thus while A is turning a complete revolution, or 360degrees, B is turned only halt way round, or 180 degrees. The Fig. 335-. angular velocity of B is therefore only one-half of A. It willbe seen, then, that while the linear velocity of the circumfer-ences of the two such wheels is the same, the angular velocityof the large one is only half that of the small one. This angu-1 ir vol is always in inverse prop
. The railroad and engineering journal . revolution .5 is turned only iSo degrees. The amount of this turn-ing, expressed in degrees or angular units, is called the aii^iihtrvelocity. Thus while A is turning a complete revolution, or 360degrees, B is turned only halt way round, or 180 degrees. The Fig. 335-. angular velocity of B is therefore only one-half of A. It willbe seen, then, that while the linear velocity of the circumfer-ences of the two such wheels is the same, the angular velocityof the large one is only half that of the small one. This angu-1 ir vol is always in inverse proportion to the diameters of the wheels. The relative velocities of wheels of different sizeswill be discussed farther on. It has been remarked that if the wheels are in contact, that ifone of them is turned the other will also revolve, provided theresistance to turning is not greater than the friction betweenthe two wheels. Suppose, now, that the wheel B was requiredto lift a weight, W, by means of a string, s, wound around itsaxle. By varying the pressure of the wheel A upon B at thepoint of contact a, the friction between the wheels maybe madesufficient for the lifting of the weight, if the latter is not toogreat. Two smooth wheels in contact will, however, always beliable to slip in relation to eac
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
