Measurements of Work
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-74
2025-11-04
35
The amount of work done varies directly as the force employed and the distance through which it acts. Hence the formula may be written
Work = FS
There are four fundamental units of work, as follows, depending on the units in which F and S are expressed:
Absolute Units
- The erg is the work done by a force of 1 dyne acting through a distance of 1 centimeter.
- The foot poundal is the work done by a force of poundal acting through a distance of 1 foot.
Gravity Units
- The kilogrammeter is the work done in raising 1 kilogram 1 meter vertically against the force of gravity.
- IV. The foot pound is the work done in raising 1 pound 1 foot vertically against the force of gravity.
Other units of work may be used, depending upon the conditions. Since the erg is a very small unit, a larger unit, called the joule, is sometimes used; 1 joule = 107 ergs, or 10,000,000 ergs. The foot pound and the kilogrammeter are the units generally used in engineering work.
TABLE OF EQUIVALENTS AT NEW YORK
1 pound = 32.16 poundals.
1 foot pound = 32.16 foot poundals.
1 poundal =
pound = 1/2 oz. nearly.
1 gram = 980.2 dynes.
1 kilogrammeter = 98,020,000 ergs.
1 kilogrammeter = 7.233 foot pounds.
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