[Illustration: FIG. 94.--Crude method of farming.]
Lifting heavy weights through great distances is not the only way in
which work is done. Painting, chopping wood, hammering, plowing,
washing, scrubbing, sewing, are all forms of work. In painting, the
moving brush spreads paint over a surface; in chopping wood, the
descending ax cleaves the wood asunder; in scrubbing, the wet mop
rubbed over the floor carries dirt away; in every conceivable form of
work, force and motion occur.
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