Newtons First Law
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-50
2025-11-01
72
If a body is left in a certain place, and after an interval it is not found there, we understand at once that it has been removed, that some force has been brought to bear upon it. If, however, a body is in motion, we cannot prove by actual experiment that it tends to go on in the same straight line, as the law states, because it is not possible to remove all resistances to a moving body, and these resistances are forces. But if the resistances are made as little as possible, the motion continues much longer. If a ball is rolled first on the ground, then on a floor, and then on smooth ice, with the same force each time, the effect of the reduced resistance is each time shown in the increased distance to which the ball rolls.
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