{"id":78,"date":"2020-12-14T19:57:55","date_gmt":"2020-12-15T00:57:55","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/?post_type=chapter&p=78"},"modified":"2021-01-03T18:15:14","modified_gmt":"2021-01-03T23:15:14","slug":"units-of-measurement-from-around-the-world","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/chapter\/units-of-measurement-from-around-the-world\/","title":{"raw":"Units of Measurement from around the World","rendered":"Units of Measurement from around the World"},"content":{"raw":"The four basic quantities of time, length, mass and force are related by Newton's Law of Motion, F = net force = ma.\u00a0<\/strong> So the units for these cannot be selected arbitrarily.\r\n

Syst\u00e8me International (SI) Units or \"the metric system\"<\/h1>\r\nThe International System of Units, is abbreviated SI to honour the French \"Syst\u00e8me International d'Unit\u00e9s\".\u00a0 https:\/\/www.bipm.org\/en\/measurement-units\/, from the Bureau International des Poids and Mesures.\u00a0 In 1901 they chose g at a standard location to equal g = 9.806 65 m\/s2<\/sup> or 9.81 m\/s2<\/sup>\u00a0 to three significant figures.\r\n\r\nLength is in metres, time is in seconds, mass is in kilograms and force is in newtons where newtons are a derived unit.\r\n\r\nThe abbreviations are m, s, kg, N, where 1 N = 1 kg \u00b7 m\/s2<\/sup>.\r\n

U.S. Customary (FPS) or \"the imperial system\"<\/h1>\r\nIn the United States, one of only three countries to still use what is often called the Imperial System, is often called the FPS for foot-pound-second.\u00a0 https:\/\/www.zmescience.com\/other\/map-of-countries-officially-not-using-the-metric-system\/<\/a>\r\n\r\nLength is measured in feet, time in seconds and force in pounds.\r\n\r\nThe abbreviations are ft, s, lb.\r\n\r\nMass is measured in a derived unit called a slug where 1 slug = 1 lb \u00b7 s2<\/sup>\/ft\r\n

Conversion of Units<\/h1>\r\n1 pound = 1 lb = 4.448 N\r\n\r\n1 slug = 14.59 kg\r\n\r\n1 ft = 0.3048 m\r\n\r\nThe inch was redefined in terms of the metre such that 1 inch is exactly 0.0254 m in 1933.\r\n\r\n \r\n\r\nAlso, you will need to know that in the FPS system\r\n\r\n1 foot = 1 ft = 12 inches = 12 in\r\n\r\n5280 feet = 52890 ft = 1 mile = 1 mi\r\n\r\n1000 pounds = 1 kip (kilo-pound)\r\n\r\n2000 pounds = 1 ton\r\n\r\n1000 kg = 1 metric ton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1 metric ton = 2204.6 pounds on the surface of the Earth where g = 9.80665","rendered":"

The four basic quantities of time, length, mass and force are related by Newton’s Law of Motion, F = net force = ma.\u00a0<\/strong> So the units for these cannot be selected arbitrarily.<\/p>\n

Syst\u00e8me International (SI) Units or “the metric system”<\/h1>\n

The International System of Units, is abbreviated SI to honour the French “Syst\u00e8me International d’Unit\u00e9s”.\u00a0 https:\/\/www.bipm.org\/en\/measurement-units\/, from the Bureau International des Poids and Mesures.\u00a0 In 1901 they chose g at a standard location to equal g = 9.806 65 m\/s2<\/sup> or 9.81 m\/s2<\/sup>\u00a0 to three significant figures.<\/p>\n

Length is in metres, time is in seconds, mass is in kilograms and force is in newtons where newtons are a derived unit.<\/p>\n

The abbreviations are m, s, kg, N, where 1 N = 1 kg \u00b7 m\/s2<\/sup>.<\/p>\n

U.S. Customary (FPS) or “the imperial system”<\/h1>\n

In the United States, one of only three countries to still use what is often called the Imperial System, is often called the FPS for foot-pound-second.\u00a0 https:\/\/www.zmescience.com\/other\/map-of-countries-officially-not-using-the-metric-system\/<\/a><\/p>\n

Length is measured in feet, time in seconds and force in pounds.<\/p>\n

The abbreviations are ft, s, lb.<\/p>\n

Mass is measured in a derived unit called a slug where 1 slug = 1 lb \u00b7 s2<\/sup>\/ft<\/p>\n

Conversion of Units<\/h1>\n

1 pound = 1 lb = 4.448 N<\/p>\n

1 slug = 14.59 kg<\/p>\n

1 ft = 0.3048 m<\/p>\n

The inch was redefined in terms of the metre such that 1 inch is exactly 0.0254 m in 1933.<\/p>\n

 <\/p>\n

Also, you will need to know that in the FPS system<\/p>\n

1 foot = 1 ft = 12 inches = 12 in<\/p>\n

5280 feet = 52890 ft = 1 mile = 1 mi<\/p>\n

1000 pounds = 1 kip (kilo-pound)<\/p>\n

2000 pounds = 1 ton<\/p>\n

1000 kg = 1 metric ton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1 metric ton = 2204.6 pounds on the surface of the Earth where g = 9.80665<\/p>\n","protected":false},"author":9,"menu_order":4,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-78","chapter","type-chapter","status-publish","hentry"],"part":161,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapters\/78","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/wp\/v2\/users\/9"}],"version-history":[{"count":6,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapters\/78\/revisions"}],"predecessor-version":[{"id":216,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapters\/78\/revisions\/216"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/parts\/161"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapters\/78\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/wp\/v2\/media?parent=78"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/pressbooks\/v2\/chapter-type?post=78"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/wp\/v2\/contributor?post=78"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/bcengrphys3\/wp-json\/wp\/v2\/license?post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}