(1) Units, Significant Figures, and Order of Magnitude

# (1) Units, Significant Figures, and Order of Magnitude -...

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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 10-24 yocto- y 10-21 zepto- z 10-18 atto- a 10-15 femto- f 10-12 pico- p 10-9 nano- n 10-6 micro- μ 10-3 milli- m 10-2 centi- c 10 3 kilo- k 10 6 mega- M 10 9 giga- G 10 12 tera- T 10 15 peta- P 10 18 exa- E 10 21 zetta- Z 10 24 yotta- Y 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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(1) Units, Significant Figures, and Order of Magnitude -...

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