A Glance At the Physical Sciences Or the Wonders of Nature in Earth Air And
A Glance At the Physical Sciences Or the Wonders of Nature in Earth Air And
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In such a construction, it is evident that the weight for instance, ten pounds is equally supported by each end of the rope, and that a man holding up one end, only bears half of it, or five pounds ; but to raise the weight one foot, he must draw up two feet of rope ; therefore, with the pulley, he lifts five pounds two feet, when he would be obliged to lift ten pounds one foot without the pulley.
This kind of pulley, however, possesses no mechan- ical advantage. To raise a pound weight from th...e ground at one end of the cord, the power of one pound must be exerted at the other. Its object, then, is not to save power, but to give convenience in pulling. For instance, by pulling downwards, a weight may be raised upwards ; or, by pulling in one direction, a load may be made to proceed in another. Thus, in drawing a bucket out of a well, it is much easier to pull down- wards, by means of a rope passing through a pulley 94 THE MECHANICAL POWERS.
over the head, than upwards, by drawing directly at the bucket.
What to read after A Glance At the Physical Sciences Or the Wonders of Nature in Earth Air And?
You can find similar books in the "Read Also" column, or choose other free books by Goodrich, Samuel G. (Samuel Griswold), 1793-1860 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In such a construction, it is evident that the weight for instance, ten pounds is equally supported by each end of the rope, and that a man holding up one end, only bears half of it, or five pounds ; but to raise the weight one foot, he must draw up two feet of rope ; therefore, with the pulley, he lifts five pounds two feet, when he would be obliged to lift ten pounds one foot without the pulley.
This kind of pulley, however, possesses no mechan- ical advantage. To raise a pound weight from th...e ground at one end of the cord, the power of one pound must be exerted at the other. Its object, then, is not to save power, but to give convenience in pulling. For instance, by pulling downwards, a weight may be raised upwards ; or, by pulling in one direction, a load may be made to proceed in another. Thus, in drawing a bucket out of a well, it is much easier to pull down- wards, by means of a rope passing through a pulley 94 THE MECHANICAL POWERS.
over the head, than upwards, by drawing directly at the bucket.
What to read after A Glance At the Physical Sciences Or the Wonders of Nature in Earth Air And?
You can find similar books in the "Read Also" column, or choose other free books by Goodrich, Samuel G. (Samuel Griswold), 1793-1860 to read onlineMoreLess
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