Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...case of weight 7 cwts. is hauled up a plane inclined at 40. Find the work done if the coefficient of friction is 0-6 and the plane is 25 feet long. If released at the top is the friction sufficient to prevent it sliding down? 22. A box weighing 450 lbs. is slowly hauled up a rough inclined plane of length 30 feet, the top of the plane being 12 feet above the bottom. If the amount of work expended is 3 foot-tons, find the coefficient of friction for the box and the plane. 23. A box, weighing 240 lbs., is supported on a plane inclined at 40 to the horizon by a rope attached to it and inclined at 20 to the plane. If the coefficient of friction is 0.4, what is the least pull in the rope required to move the box up the plane? Experiment 4. Coefficient of Friction by Inclined Plane.--A plane is inclined at a certain angle i to the horizon and a block of wood slides on the plane being attached by a thread which passes over a smooth moving pulley fixed at the top of the plane, to a scale-pan. The thread should be attached to a point on the block so that it is parallel to the plane. The methods of experimenting are as follows: (1) The plane is fixed at a definite inclination, which should be considerably greater than the angle of friction, and the least force which will pull the block up the plane is found by putting weights into the scale-pan. Weights of various magnitudes are put on the block, and in each case, the least force requisite to pull the block up the plane is determined. (2) In a similar manner we find the least force which will keep the block from sliding down the plane. An approximate value of the coefficient of friction can be obtained by finding the inclination of the plane at which the block will just slide down the plane of its own accord. In the ...
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