General Science

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slowly raises Q. A very com- plex machine is that seen in Figure 117. In Section 150, -we learned that the amount of work done depends upon the force 1/2 MAN'S WAY OF HELPING HIMSELF exerted, and the distance covered, or that W force x dis- tance. A man who raises 5 pounds a height of 5 f ee t does far more work than a man who raises 5 ounces a height of 5 inches, but the product of force by distance is 25 in each case. There is difficulty because we have not selected an arbitrary unit of work.
... The unit of work chosen and in use in practical affairs is the foot pound, and is defined as the work FIG. 116. - A traveling crane. Done when a force of I pound acts through a distance of I foot. A man who moves 8 pounds through 6 feet does 48 foot pounds of work, while a man who moves FIG 117. A farm engine putting in a crop.
8 ounces (| pound) through 6 inches (\ foot) does only one fourth of a foot pound of work.
WASTE U'ORK AND EFFICIENT IVORK 173 168. The Power or the Speed with which Work is Done.


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