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المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-81

2025-11-04

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The weight of a body is the measure of the mutual attractior that exists between the earth and that body. This force is the resultant of the attractions between the earth and all the particles of the body.

The weights of any two bodies at the same place are proportional to their respective masses. Since the polar diameter of the earth is    miles less than the equatorial, it is evident that the weight of a body will vary with the latitude as well as with the elevation above the sea level. The weight of a body carried from either pole toward the equator is decreased by the increase in its distance from the center. There is also an apparent decrease, owing to the increase in the centrifugal force of the earth's rotation. Bodies on the equator move with a velocity of more than a thousand miles per hour, and the centrifugal force there is    sand miles per hour, and the centrifugal force there is of the force of gravity, while at the poles it is zero. Should the earth rotate 17 times as fast as it now does, the centrifugal force would equal the force of gravity, since centrifugal force varies as the square of the velocity .