Transcription of Systems of Units and Conversion Factors - Cengage
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Systems of Units and Conversion Factors - Cengage
3/3/11 7:53 AM Page B1. B. Systems of Units and Conversion Factors Systems OF Units . Measurement Systems have been a necessity since people first began to build and barter, and every ancient culture developed some sort of measurement sys- tem to serve its needs. Standardization of Units took place gradually over the centuries, often through royal edicts. Development of the British Imperial Sys- tem from earlier measurement standards began in the 13th century and was well established by the 18th century. The British system spread to many parts of the world, including the United States, through commerce and colonization. In the United States the system gradually evolved into the Customary system (USCS) that is in common use today. The concept of the metric system originated in France about 300 years ago and was formalized in the 1790s, at the time of the French Revolution.
B4 APPENDIX B Systems of Units and Conversion Factors TABLE B-1 PRINCIPAL UNITS USED IN MECHANICS International System (SI) U.S. Customary System (USCS) Quantity Unit Symbol Formula Unit Symbol Formula Acceleration (angular) radian per second squared rad/s 2radian per second squared rad/s Acceleration (linear) meter per second squared m/s2 foot per second squared ft/s2
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