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Unformatted text preview: How does Physics work? How does Physics work? Observe and measure Build a model Make a prediction m a t h m a t h m a t h m a t h m a t h m a t h check units SI Units SI Units Length : The meter (1 m = 3.281 ft) Mass : The kilogram (1 kg = 0.06585 slug) Not the same as weight! on Earth 1 kg weighs 2.205 lb on the Moon 1 kg weighs 0.368 lb Time : The second (s) Used by scientific and engineering communities and almost everywhere in the world. Combinations: Unit of speed m/s Unit of force (Newton) is 1 N =1 kg m/s² Multiples of Units Multiples of Units Y yotta 10 24 Z zetta 10 21 E exa 10 18 P peta 10 15 T tera 10 12 G giga 10 9 M mega 10 6 k kilo 10 3 c centi 102 m milli 103 µ micro 106 n nano 109 p pico 1012 f femto 1015 a atto 1018 z zepto 1021 y yocto 1024 Formal conversion of units: •Multiply by the appropriate representation of 1 to cancel the unwanted units away: •eg. convert 10 mph into m/s = × × = mile 1 m 1609 s 3600 h 1 h mile 10 h mile 10 m/s 47 . 4 = Example...
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This note was uploaded on 04/16/2008 for the course PHYSICS 221 taught by Professor Johnson during the Fall '06 term at Iowa State.
 Fall '06
 Johnson
 Physics, Work

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